Malicious PDF — malware analysis report

Static analysis result for SHA-256 6437a01f0fb3c9b1…

MALICIOUS

PDF

78.0 KB Created: 2021-04-10 08:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 41ee7055abd8f9859223fb8d9f799fd1 SHA-1: 2126cd978dadf42274e6ecb79f7c95798acc2972 SHA-256: 6437a01f0fb3c9b105edc91aecd88648c6db3e0680fe19939e20ad872b59a6a2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('midufefew.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to obscure malicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=is+panda+express+orange+chicken+good+for+you PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416332/normal_6029cb553c5ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471704/normal_601b8223dc801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414487/normal_5fe140b5f2cba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416501/normal_5fff7f9fc2bcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_605995026c6b8.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/gozunojoweguxo-lovekibes-dubinetiz-fotujizukesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389084/normal_604dc912d959b.pdfIn PDF document text
    • http://kuvezowepo.scienceontheweb.net/arquitectura_bizantina_libro.pdfIn PDF document text
    • https://futuziduxe.weebly.com/uploads/1/3/4/5/134508203/2616867.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/38968899450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rixuroruwe.myartsonline.com/zokogivota.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/spongebob_game_of_life_online_free.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_fc81a315b308430a8c5df30b4cfda821.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/gi_bleeding_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/zujamizibonogusavuminibi.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_8ac4fcb0efb94af79601eaf69d33758e.pdf?index=trueIn PDF document text
    • http://nokejufesuw.atwebpages.com/business_productivity.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_bafe77f15230462d8b36c58a3b5c5766.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_a07c97e63b664b63a29e9b3394b8e766.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gawabog/beethoven_piano_sonata_17.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_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 5556 bytes
SHA-256: ee49b571a2e7481635541f86af8ebd3ee87d6acf35e899f83606338d8fd8e5e8
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 12904 bytes
SHA-256: ce31415e44f717b7524b86195777202d0948a6fb2e6f16c53d82ca62fba262fa

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