Malicious PDF — malware analysis report

Static analysis result for SHA-256 700904ae8af07ceb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-17 09:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19ecb976ccd7e12b0ca065b1dc8d731b SHA-1: bc9ffaa898f11b90d03bcdaf394f155d3b121749 SHA-256: 700904ae8af07ceb7853781168c1485e9f0f76244c47948b46c965445bece6a4
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains numerous external links, many hosted on disposable domains, characteristic of a link farm. The 'SE_ADVANCE_FEE_SCAM_LURE' heuristic and the presence of URLs related to 'free bookkeeping spreadsheet' strongly suggest an advance-fee fraud scheme. The ML classifier and ClamAV detection further confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://dafemum.ru/123?utm_term=free+bookkeeping+spreadsheet+for+small+business
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/b89778ccfc4.pdf
    • https://cdn-cms.f-static.net/uploads/4425483/normal_605022e2efd92.pdf
    • https://derugipuze.weebly.com/uploads/1/3/0/8/130814861/6047362.pdf
    • https://giximanuv.weebly.com/uploads/1/3/4/5/134526051/c3c989c30c.pdf
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/dd04c4.pdf
    • https://cdn-cms.f-static.net/uploads/4446651/normal_604ca12ccb5e4.pdf
    • https://cdn-cms.f-static.net/uploads/4455881/normal_600eab1b835a3.pdf
    • https://tivufele.weebly.com/uploads/1/3/4/6/134615601/nivasakow_rinaxo_jezitesa_giredilelaz.pdf
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/6144529.pdf
    • https://cdn-cms.f-static.net/uploads/4461202/normal_600ce4eb2a7d9.pdf
    • http://santand-es.com/teaching_english_as_a_foreign_language_free_online_courseyc7ns.pdf
    • https://maxijegiv.weebly.com/uploads/1/3/4/1/134131269/bilor.pdf
    • http://bluebadgeform.com/dm_screengge8e.pdf
    • https://fasadosuz.weebly.com/uploads/1/3/4/0/134012998/4305706.pdf
    • http://the-english-temple.com/streamline_departures_teacher_s_bookjzyuz.pdf
    • https://cdn-cms.f-static.net/uploads/4474445/normal_5fdb0ed85a80d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_d318dad772bc49409052eb5cb8f3a590.pdf?index=true
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_48ded6344c2540929f3686ef73787d01.pdf?index=true
    • 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_off0000f54d.bin
96da4f6477c189ac4e162ac31f0aeaa256abcd68c4cf4f7aa7735bc87b791e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 5616 bytes
font_01_sfnt_off00010841.bin
cbddd59cb2aac04cd7dc952d9da4b83feb5257b1a311384136c150d54c2ee192		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 10612 bytes

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