Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8e31a1c88bba96…

MALICIOUS

PDF

113.4 KB Created: 2021-03-19 16:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 512eb9b08baf5b013f9619b5c5275492 SHA-1: f5ff88386c41e84c4d95fccf4f1932fa91a80f4d SHA-256: 7f8e31a1c88bba96a6ad89f22f300788f01bcdd4466a9c56c38b167a3f086f96
264 Risk Score

Malware Insights

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

The PDF contains numerous links, including a critical malicious redirector link to dafemum.ru, suggesting a phishing or malware distribution attempt. The presence of a link farm on disposable hosting further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • 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://dafemum.ru/strik?utm_term=shadowrun+game+order In PDF document text
    • https://cdn.sqhk.co/ledodatefu/Mhfgigf/events_happening_today_nyc.pdfIn PDF document text
    • https://roxomikanu.weebly.com/uploads/1/3/0/8/130873860/satilujilivono-xudemilixewa-jaguvez.pdfIn PDF document text
    • https://cdn.sqhk.co/metajewamiva/ggy8iil/fefilor.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/hhxfXSW/51457450855.pdfIn PDF document text
    • https://cdn.sqhk.co/buzomesil/1gjmigG/tuxusukezuriva.pdfIn PDF document text
    • https://vipuwajaziw.weebly.com/uploads/1/3/5/3/135398090/01c8bf66049b4b.pdfIn PDF document text
    • https://kuwupixunipava.weebly.com/uploads/1/3/3/9/133986845/suwewewa_dolevemazop_xamaledagitosa_lorisorudejiju.pdfIn PDF document text
    • https://cdn.sqhk.co/nanagajog/7ihghhc/biztalk_mapper_multiple_source_schemas.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/Dieljg5/pisuzexipowesil.pdfIn PDF document text
    • http://bigafoporake.22web.org/biwifosuduvudiziz.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/saxewetedunuta_muwozemewogif_xutimadefupive_figudafexofexe.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://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_7cae5151257940df95a7c0a295cddf61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/51721792963.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/timenizel.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_90e3a29e11b24773b9ddafccdc0dfb09.pdf?index=trueIn PDF document text
    • http://gaditimotef.rf.gd/43438023740.pdfIn PDF document text
    • http://kuzelewekupe.epizy.com/73074002787.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/car_log_book_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/ritisufuvibisuvow.pdfIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_37187e09cd9f4beea7b32b99f377c8ae.pdf?index=trueIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_075bc9961c324f6da062b8376821f073.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_364bcfe03c3e46bd9eefbeda55a2773e.pdf?index=trueIn PDF document text
    • http://fedasumenusum.rf.gd/mohini_sethi_catering_management.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_off00016faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FAF 4980 bytes
SHA-256: 1af2635d2c4c058fbd13907184acbf2514b0d59e8a3c009117c39a535641b562
font_01_sfnt_off00018068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18068 12032 bytes
SHA-256: a5e639ddfbc0bd2d330bb735d8c24c6ac7efea05ba847a2db6ea6aebed9d6d96
font_02_sfnt_off0001a979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A979 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230