Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7792dfa1189cd14…

MALICIOUS

PDF

73.8 KB Created: 2021-02-28 18:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2f769ad0988157ae3a95f257f3727b3e SHA-1: 8941c2d66ae8a5aa0a5df28789e296903aaaf59e SHA-256: b7792dfa1189cd149b40c7e79acc7722d7271357c8b7201919e127784c96d2e7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically redirecting to a link farm designed to host numerous PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jottigo.ru/123?utm_term=excellence+in+business+communication+pdf+download PDF link annotation
    • https://cdn.sqhk.co/zitibidino/8KieGmH/28642218476.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/rjhjagc/datajaxokurebuxax.pdfIn PDF document text
    • http://talkme-news.info/starfall_abcs_gamesfmiso.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/hdgdPie/flower_pot_painting_ideas_easy.pdfIn PDF document text
    • http://7lessons.website/outlook_create_email_template_shared_mailboxq6lob.pdfIn PDF document text
    • http://mosdendy.store/entrepreneurship_and_small_business_management_study_guidev67ni.pdfIn PDF document text
    • https://cdn.sqhk.co/damapegapi/1hgjahc/raft_island_disappeared.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wowadepadon.rf.gd/20807682661.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/22114465141.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/how_to_automatically_multiply_two_columns_in_excel.pdfIn PDF document text
    • http://guzumirofega.epizy.com/chemistry_chapter_4_and_5_test_review.pdfIn PDF document text
    • http://watimesuw.rf.gd/guided_reading_activity_8-_1_world_geography.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/konapewe.pdfIn PDF document text
    • https://s3.amazonaws.com/fulazelof/mimevorusewuw.pdfIn PDF document text
    • http://mutunibe.rf.gd/fire_evacuation_plan_template_victoria.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_off0000e69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69C 5460 bytes
SHA-256: 4d4d3924ba89edeebc97a8cdb07d621ed3eb630e83b8e3a837167fca9ff31fc2
font_01_sfnt_off0000f935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 9604 bytes
SHA-256: 8188ce337a4c569492b61ccdb6ceab0e1a120986f063dfdab6137b838c6e8f87

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