Malicious PDF — malware analysis report

Static analysis result for SHA-256 79084d7bf2a25118…

MALICIOUS

PDF

87.9 KB Created: 2021-03-30 16:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a49d923160fcaa323573f90f7f76731 SHA-1: ca2ec096a7a57a4469b4ddcdc26ee899dc818daa SHA-256: 79084d7bf2a2511892757e381049c57a002d8df685df7f4ebf51d0e00c07cc12
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains a link farm with numerous external URLs, including one pointing to jottigo.ru, suggesting a phishing or SEO scam. The document body, though heavily obfuscated, contains keywords related to a biology textbook download, which is a common lure for such attacks. No scripts were extracted, but the presence of multiple external links indicates a likely attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jottigo.ru/award?keyword=biology+campbell+reece+pdf+free+download PDF link annotation
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/bd9b737a.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/papakavuk.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/38dfaed48f39.pdfIn PDF document text
    • https://wotudopis.weebly.com/uploads/1/3/4/6/134679731/3673328.pdfIn PDF document text
    • https://wokoxulepimam.weebly.com/uploads/1/3/1/4/131438011/7ce44445390.pdfIn PDF document text
    • https://rikumuxazomibib.weebly.com/uploads/1/3/6/0/136082685/zusukivezapawasaxek.pdfIn PDF document text
    • https://xojovirasada.weebly.com/uploads/1/3/1/6/131637125/patofosepuduwamag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_15f86f5808bc4cdb805f4ef034a5c9a0.pdf?index=trueIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_35cccc46667a4df7af812fc00312fce2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/what_is_ptc_cust_ira_fbo.pdfIn PDF document text
    • https://baad1762-ad72-434c-be9a-9de7d8068d01.filesusr.com/ugd/61395f_661da23c37ee4bbeb07dd6bfbfc46c47.pdf?index=trueIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_a244564991414d77a9c0781876d522d4.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_c78d2d918e424b4f87432a61d942456b.pdf?index=trueIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_95053b9efee946909ad2d1a3c0bd61d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/chemical_engineering_tracking_sheet_wpi.pdfIn PDF document text
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_4fac72c119834492b287ef15ccdad902.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_fdcd055d3cd94321adbef72747babd08.pdf?index=trueIn PDF document text
    • https://574dee49-ee40-4737-ae02-340ce2b26f9d.filesusr.com/ugd/b44cf7_c06031c2a8484ecaace38185e0a6e0b4.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_864577f412234539bc25e53f693c6c12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/cell_reports_immunology.pdfIn PDF document text
    • https://c140f178-ee45-427e-91fe-a3c5f821f67e.filesusr.com/ugd/ebc5f9_df33a3c79cc2441cb9cb52367a0ea6fc.pdf?index=trueIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_1f02557b335c4540bec859520db277ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wefadep/showtime_rotisserie_cooking_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 5388 bytes
SHA-256: 647669745716f23d7bc690ac21ed905e950f1666455a4833c9f1cb6bf5596324
font_01_sfnt_off000113e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E5 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off00011c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C75 11240 bytes
SHA-256: ba95b340df2cfb36ceb6c6d738d8f42b99144760222aef7a5fc387a5946eb4ea
font_03_sfnt_off000142d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D5 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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