Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad53312d5cbc4b34…

MALICIOUS

PDF

73.3 KB Created: 2021-02-21 23:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3c345b26f4a27c3c65751db3d50f389f SHA-1: 2423fe511c332117d7b89cb66fbeb23bffa9391a SHA-256: ad53312d5cbc4b34fd7eee465a0cf6111830cbc210e4a0ac2faaf5faccdee043
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'physics classroom work worksheet answers', which is a common tactic for phishing or malware delivery via spearphishing attachments.

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://bologen.ru/wix?keyword=physics+classroom+work+worksheet+answers PDF link annotation
    • http://kupivse.xyz/jowulodufogekul1oupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_601b0177644b5.pdfIn PDF document text
    • http://fertpin.online/99554690161iyw2h.pdfIn PDF document text
    • http://options.expert/indian_advertising_agency_profile32bpa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383132/normal_5fc909dcd459b.pdfIn PDF document text
    • http://my-favshopf.online/wisuxitunulevenorozak1fb.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/horror_movies_2018_in_englisht16rl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504870/normal_6027524e43135.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449599/normal_5fd6e32938b21.pdfIn PDF document text
    • http://justamorem.com/nail_salons_open_now_in_my_area30k8g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_602b9ae252b5e.pdfIn PDF document text
    • http://forexgeeks.net/dark_angel_season_1_episode_guide4t62v.pdfIn PDF document text
    • http://extrameets.fun/information_technology_help_desk_jobs_near_mepaxh3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fce571015fe7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385634/normal_5fd779213c2cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 5300 bytes
SHA-256: f46a39a39b2b220e5fc494c037de131803f50e58860d15b743492d332b31627c
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10696 bytes
SHA-256: 50d2defcbea2051e362bbf75bd094dbcee3be79d9fe320ddaf90dfc54e6de965

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