Malicious PDF — malware analysis report

Static analysis result for SHA-256 55ae82c87500a6f0…

MALICIOUS

PDF

82.3 KB Created: 2021-03-31 20:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7bca66c4b00aaf33b079c93083760921 SHA-1: 29fe8e606e73f2e15b2500671a3639b9d0b44a06 SHA-256: 55ae82c87500a6f08371e981c98a52ee65a7d54e6125248e827f5f557b9af2a6
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=allegiant+pdf+read+online+free PDF link annotation
    • https://cdn.sqhk.co/teketerep/gjjhqZ5/html_table_rounded_corners_css_without_images.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/jomaputobetopasifukutam.pdfIn PDF document text
    • https://cdn.sqhk.co/vakolitakap/i78Dhbt/discount_calculator_excel.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/dugavuvudexubabevefex.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/mexoxo.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/adda_247_computer_capsule.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://uploads.strikinglycdn.com/files/eb6d8037-845a-497e-9919-dbd5de98dca6/94912816504.pdfIn PDF document text
    • https://9e2bb560-353e-4f5d-a08b-1363560edab4.filesusr.com/ugd/6c032c_a30167d27e694ec18e3207b8515cee1c.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_d077e26f8dbc415d9b8c43c3b96c665d.pdf?index=trueIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_75017d3e6cb1449f9b43b455e59bb0d2.pdf?index=trueIn PDF document text
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_969db2ce37fa4e66839531e8762a4cda.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24f23f8-ba47-4750-9953-86097a663e32/87087809331.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/avast_vpn_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/debukonokedesibigis.pdfIn PDF document text
    • https://973697ad-ffa4-4f9d-85cd-0c9d1ea039ee.filesusr.com/ugd/5f5755_9b65749aebf947b387264f4b9c96f026.pdf?index=trueIn PDF document text
    • http://zagupijalixi.myartsonline.com/examen_toefl_gratis.pdfIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_43e8cd2862ed4cb2b50019490a6b823a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 4808 bytes
SHA-256: 1dd3e2e07c764050c66dec01a815c2e2c473d75d1dde1f671b60e66a12045a6b
font_01_sfnt_off000107f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F3 11164 bytes
SHA-256: e07daf3a0e381153e5f08f1053fc94dd24b5596511f93863a110e9b33bf6593b
font_02_sfnt_off00012ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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