Malicious PDF — malware analysis report

Static analysis result for SHA-256 7890216a3f2e2bc8…

MALICIOUS

PDF

75.9 KB Created: 2021-02-22 21:08:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: be19acb4fb612adffe27f0c6ad97291e SHA-1: ae001d85c75867ec2bd1cdca2612722fc25308a3 SHA-256: 7890216a3f2e2bc8414d0a02ba8c1474601f36e450d8fcc942585adb5914b46e
126 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document body, though partially corrupted, contains text suggesting it's a lure for search engine traffic, directing users to external URLs. The presence of numerous external URIs, including those hosted on disposable domains and link farms, reinforces the phishing and potential malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=girl+scout+songs+repeat+after+me PDF link annotation
    • http://wuledorifik.22web.org/auto_text_option_in_word_2010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_602c3045b05b7.pdfIn PDF document text
    • https://ronurakegilapoz.weebly.com/uploads/1/3/4/8/134852428/8a81ace101705.pdfIn PDF document text
    • https://burufazifefep.weebly.com/uploads/1/3/4/5/134584298/f2732c5ebee285.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/nazepexinixetad.pdfIn PDF document text
    • http://tevojagi.iblogger.org/83437276701.pdfIn PDF document text
    • https://lisumefi.weebly.com/uploads/1/3/1/4/131408082/zoxuve.pdfIn PDF document text
    • http://whitetwo.space/bridge_to_terabithia_2_full_movieiftgm.pdfIn PDF document text
    • http://helpcenter.business/booyah_baits_xcs_squarebillo82xk.pdfIn PDF document text
    • http://on24-system.club/poromuvemerabidixusapr33d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486220/normal_601448b4d2086.pdfIn PDF document text
    • http://study-english-02.space/tutesovejomorawidinakedml8af.pdfIn PDF document text
    • https://nosozekime.weebly.com/uploads/1/3/4/6/134634018/4681451.pdfIn PDF document text
    • http://lg-supportteam.com/ruzodexudimogukogh613j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_602462b3481db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_5fe901af0810c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379603/normal_5fce48001fc2c.pdfIn PDF document text
    • http://nobirejajatit.iblogger.org/sample_on_the_job_training_certificate_format.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_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 5364 bytes
SHA-256: a130c01ca57c7543e1f65cc2d9a6ba853d60cc401a37209fc184ef51f3a66c42
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10876 bytes
SHA-256: 853d8f635a68e72e5699d845b12a1c7e125794d1f7909ab575f359637f036dab

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