Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bd8a802fb49a41…

MALICIOUS

PDF

75.7 KB Created: 2021-06-11 06:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 182a9c6c4e6fdcdea62717bf92411737 SHA-1: 00019aa695b55c10517dae8c5dc9d8dbc66b1892 SHA-256: 37bd8a802fb49a411c91bbb6d22aafc1df38f5e54ea94156e7f169dceb4686c1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'robux redeem codes 2021', a common lure for scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://inwebjor.ru/pbw?utm_term=robux+redeem+codes+2021 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376866/normal_602f33ed2c97d.pdfIn PDF document text
    • https://fidimamafiw.weebly.com/uploads/1/3/4/6/134624465/kojixate.pdfIn PDF document text
    • https://zudizobi.weebly.com/uploads/1/3/4/8/134860565/tuloxajevijafidifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418180/normal_601a0a7e6940a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479675/normal_606b5ea487642.pdfIn PDF document text
    • https://rokilero.weebly.com/uploads/1/3/4/8/134879734/1519690.pdfIn PDF document text
    • https://mopobaseburole.weebly.com/uploads/1/3/4/8/134859053/bofufepavugemi.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/bd45be.pdfIn PDF document text
    • https://nawawuxilebop.weebly.com/uploads/1/3/4/6/134679594/nozuginu.pdfIn PDF document text
    • https://zajinepimasi.weebly.com/uploads/1/3/2/8/132815118/nosebopudubigir.pdfIn PDF document text
    • https://wapejakibupoj.weebly.com/uploads/1/3/4/4/134480200/tunefolisitu_kutamavoz_bemesi_mijulizaba.pdfIn PDF document text
    • https://gobajirosalafos.weebly.com/uploads/1/3/5/3/135392744/nudotowib_wadatosuwamuze_xomigo_zalezetojizuwoz.pdfIn PDF document text
    • https://zowunekufoz.weebly.com/uploads/1/3/4/3/134371229/vivuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://murusefikuk.pbworks.com/f/libaj.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144573843/46395051400.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/6344049843.pdfIn PDF document text
    • http://fixunomavow.pbworks.com/w/file/fetch/144617592/33789347098.pdfIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144567924/48373728268.pdfIn PDF document text
    • http://jopamedet.pbworks.com/w/file/fetch/144452487/cub_cadet_526_hd_swe_manual.pdfIn PDF document text
    • http://morabef.pbworks.com/f/carta_para_felicitar_a_mi_novia_en_su_cumpleaos.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_off0000e895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE895 5384 bytes
SHA-256: e4baf80a5ae9c716bdf64d29cc7861c9f30db10b5452a9d0b1c873626debec98
font_01_sfnt_off0000fadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADF 11304 bytes
SHA-256: 6035ffbd2cba86222725fa95cd5e3c076ce2a2219b55c6f2ec3a8e56e96eb749

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