Malicious PDF — malware analysis report

Static analysis result for SHA-256 577fd143307a1006…

MALICIOUS

PDF

77.5 KB Created: 2021-05-12 18:04:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 847a420a92cafc0356c476ca79803f4d SHA-1: bf1a1d6b3a2e6bf8e7e96df9f270289f96563eb6 SHA-256: 577fd143307a10061c1a2ebb1ef090be5caf578bf284717a5599efa85cd11328
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or SEO spam. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, and one of the primary URLs points to a domain associated with malicious activity. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=the+uyghurs+strangers+in+their+own+land+pdf
    • http://vizit.store/occupational_health_psychology_average_salaryk5gyi.pdf
    • http://remont-pc.website/xemewofel3kh26.pdf
    • https://static.s123-cdn-static.com/uploads/4417983/normal_5fc5af7c378f9.pdf
    • http://discovljzg.fun/why_are_butterfly_knives_illegal_in_australia66n4q.pdf
    • http://lirifajo.sportsontheweb.net/certified_network_defender_study_guide_free_download.pdf
    • https://static.s123-cdn-static.com/uploads/4455639/normal_60071a4b86be6.pdf
    • http://kujunat.medianewsonline.com/how_to_do_a_buzz_cut_without_clippers.pdf
    • https://cdn-cms.f-static.net/uploads/4459319/normal_5feaef9b7b5bd.pdf
    • http://letaraluzim.scienceontheweb.net/fabazubep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_7eb9d14907d14ca2ba9fdd66272f8013.pdf?index=true
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_edf37668b6264d9b87f5e0001eee876f.pdf?index=true
    • https://s3.amazonaws.com/senodiw/30811049077.pdf
    • https://s3.amazonaws.com/pukaridimupo/76569735923.pdf
    • https://s3.amazonaws.com/pululusodogi/62716360237.pdf
    • https://6da1ed31-7a22-45b0-8bc5-463d376071ee.filesusr.com/ugd/29fbaf_a032a5e7282b43ee8a32fd70666fd6ee.pdf?index=true
    • https://s3.amazonaws.com/xifabilejilab/used_to_didn_t_use_to_worksheets.pdf
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_10e0539a63c34d66915e2ae9d8c67215.pdf?index=true
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_63c1f0e9f14c4276a2b8dc3c5f92b133.pdf?index=true
    • https://s3.amazonaws.com/juvuraguvutoxif/outstanding_payment_request_letter_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eea2.bin
35ba3673f62d5f4c2dd22bde4c8788e1f193a7ab359f4d1f5024d6304fd654f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA2 5444 bytes
font_01_sfnt_off0001013b.bin
8e2b9176336dbdb8914da8580a25cedd12fa16fc1556f36ab11d275443335a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 11804 bytes

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