Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a1bec0f4d234ef…

MALICIOUS

PDF

73.5 KB Created: 2021-03-02 23:00:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 03788b4f2abf788c5719a7e5042d69e4 SHA-1: da9554e1eae65347691d95b8d6a42c04dcb3b2f9 SHA-256: 85a1bec0f4d234ef5062ea608a99519c908da1c0feb3f65866d702f502a9b715
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/123?utm_term=whats+a+water+bump PDF link annotation
    • http://centerverifybadge.com/xofetujamekexinowikek2m.pdfIn PDF document text
    • http://kedugobepuged.mywebcommunity.org/42098992109.pdfIn PDF document text
    • http://help-service-support.com/83146096410ccnch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426547/normal_5ff21d8107731.pdfIn PDF document text
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/492e935c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_603a0fead3fd2.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/argumentative_essay_examples_ap_lang.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_5fd2f1cc44290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_6014144bb7d4b.pdfIn PDF document text
    • http://nomevufaneboja.mypressonline.com/twas_the_night_before_christmas_story_book_online.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/paluzemarewabirujoxu.pdfIn PDF document text
    • http://maslovauto.ru/45956339410iogh8.pdfIn PDF document text
    • https://sebumowuvuxeluz.weebly.com/uploads/1/3/5/9/135962316/bofojinekoboxapodig.pdfIn PDF document text
    • http://gakmancreatures.ru/ziduxosivosumifozax96f5i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/4061845674.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/waves_erosion_and_deposition_worksheet_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 5272 bytes
SHA-256: 9aa2d5afb097c51aaef607a0ab490bf376c7d6b62ed7040d12aee658a5166b65
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 10164 bytes
SHA-256: 2c1cd77cb75fb75d10f5edcb3a0acfc667bfb53861fef172914831df86355b96

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