Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d727e35a0a0470…

MALICIOUS

PDF

80.1 KB Created: 2021-02-20 03:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 01464de06f1014cded6b0dbbd95cc752 SHA-1: ed6ef6b02d895beb09c690386b3af5de4e477283 SHA-256: e7d727e35a0a0470daac83db840e18aa98d090b61814d2027cb663c082f75e1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=lather+and+nothing+else+character+traits PDF link annotation
    • http://canonsburglake.com/70847572431c8jjj.pdfIn PDF document text
    • https://jedurabononip.weebly.com/uploads/1/3/1/4/131453193/3999543.pdfIn PDF document text
    • http://greenbike.shop/55487620014q9kdy.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/31934747b51b.pdfIn PDF document text
    • http://durebivov.iblogger.org/soxegera.pdfIn PDF document text
    • http://iglivesupportteam.com/powiwevivevaxakz8yg5.pdfIn PDF document text
    • http://mynasert.online/965710461831el1g.pdfIn PDF document text
    • https://fiwatinizajof.weebly.com/uploads/1/3/0/8/130874156/mogipa-zafopemubi.pdfIn PDF document text
    • http://blablablacar.online/articles_of_constitution_download2uszq.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://s3.amazonaws.com/rezugekolaba/calculus_by_thomas_11th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/sasoxipavuximotel.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/dividing_fractions_word_problems_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 4932 bytes
SHA-256: 2db14600da822e777513beee9d9bb74d73cffcbb74334082feb2b1952b82b3d0
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10256 bytes
SHA-256: 5f1d69f3b28dfd7397fe3eb045fbcdd02d6637c5129e3a194a1b4340e1336395
font_02_sfnt_off00012525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c