Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0764dccba19b50…

MALICIOUS

PDF

79.0 KB Created: 2021-04-16 21:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1f356ea8bcb76b94ee6ebeb281758ae0 SHA-1: 9204bfb771f29adee482ddec6a3b19a4d25a8d24 SHA-256: 3d0764dccba19b504b6a4e9a809672b482531699f168979c7d5f2127c2ee4110
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to reference 'Oxford english grammar course advanced', likely a lure to entice users to click the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://golowaki.ru/strik?utm_term=oxford+english+grammar+course+advanced PDF link annotation
    • https://vexalujonesudu.weebly.com/uploads/1/3/4/7/134738084/1565c12c37ca81.pdfIn PDF document text
    • https://gakezepatirana.weebly.com/uploads/1/3/2/7/132712251/3844828.pdfIn PDF document text
    • https://cdn.sqhk.co/taxotuzu/Pbhhqhe/best_shudder_movies_2020.pdfIn PDF document text
    • https://wudufedowuton.weebly.com/uploads/1/3/2/8/132815791/sixikotu-xagaj-dozatidofekuxud-fodinipe.pdfIn PDF document text
    • https://cdn.sqhk.co/toviranevu/omSoijj/kyun_rabba_armaan_malik_song_lyrics.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/c9bc6e0c6.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/GhcujgP/24248038310.pdfIn PDF document text
    • http://visunuduxat.mypressonline.com/82644832429.pdfIn PDF document text
    • http://duzegotola.medianewsonline.com/7421364237.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/MghFMha/ifttt_alternatives_alexa.pdfIn PDF document text
    • https://bitojeromewex.weebly.com/uploads/1/3/0/8/130874526/fexizutuxuxelo_wibebonulel_sudov_mipijosok.pdfIn PDF document text
    • https://razezoxuwen.weebly.com/uploads/1/3/1/4/131453099/37b23517.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/Jgd5hyc/daily_work_to_do_list_printable.pdfIn PDF document text
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/b57206d55.pdfIn PDF document text
    • https://jepirozo.weebly.com/uploads/1/3/4/4/134474462/4f3cacc09.pdfIn PDF document text
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/6b4bb67e35d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zorikeroz.onlinewebshop.net/cebuella_pygmaea.pdfIn PDF document text
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_5b9c2fd326e44034a82e1c33766f958f.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_6a6decb927eb450a94161539da2513ae.pdf?index=trueIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_de6f04b4913341c88018c9553366d703.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wizedumi/jitiwupawojulinaxelo.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/geez_amharic_dictionary_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/what_is_the_definition_of_enthalpy_change_of_atomization.pdfIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_b581cd295163411abb9ba9b9d8ded4bd.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_9d75d2fd43ce4f888fe16269fe44ddbe.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 5592 bytes
SHA-256: 803297d870eccfe0bb03a59c297ce0f085fc31ac74198bb69e692e5b7e46823d
font_01_sfnt_off00010801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10801 11232 bytes
SHA-256: b555e64d5f9b7eaa0323f2d23f7134dab4a9a349d5062054de9f9bafd1932ec6

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