Malicious PDF — malware analysis report

Static analysis result for SHA-256 2072cdf9c7fcd8d7…

MALICIOUS

PDF

78.9 KB Created: 2021-06-02 20:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 90669dc017e28f006eb7477f5d855ce2 SHA-1: be92e9d9c80b1955c4fadc079db82e0e96aade78 SHA-256: 2072cdf9c7fcd8d746586827831357b0eb94749f0122ff360c52b2786fb3055c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware via the linked PDFs. No scripts were extracted, but the primary attack pattern involves directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pistant.ru/pbw?utm_term=what+numbers+do+you+use+to+prank+call PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472198/normal_603e982aa1cfe.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4481830/normal_60afe351caf1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_605678ef38894.pdfIn PDF document text
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/293540.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5ffcaf4884ab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_601e74e2b1fe4.pdfIn PDF document text
    • https://lakaporizad.weebly.com/uploads/1/3/4/2/134234628/rizinobolotugu.pdfIn PDF document text
    • https://radoxawema.weebly.com/uploads/1/3/0/7/130738714/rixojebakujivare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420617/normal_604fbd5f35b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_60543d5df1c05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498348/normal_601eb9e254b2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459325/normal_5fcad34d25ba6.pdfIn PDF document text
    • https://woluxubofij.weebly.com/uploads/1/3/1/3/131383763/9432ba98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420597/normal_604751b91c2f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5fe15b799ad67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fcd0965aa7be.pdfIn PDF document text
    • https://fefejixoloxit.weebly.com/uploads/1/3/0/9/130969032/5648978.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
    • http://sozakuvepar.pbworks.com/f/9935141609.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144457062/9363184438.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144413847/what_is_the_difference_between_direct_and_indirect_object_pronouns_in_italian.pdfIn PDF document text
    • http://savavaze.pbworks.com/f/28468362816.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/49234420623.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144478884/rmlau_result_with_marksheet_2011.pdfIn PDF document text
    • http://genarozep.pbworks.com/w/file/fetch/144489180/pattern_block_puzzles_online.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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 5468 bytes
SHA-256: ba250dd76a087635b0c1f49e7076c31bc53b71b2762c0b7c22b47f0ad7280bf5
font_01_sfnt_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 11236 bytes
SHA-256: 2fa50d1aaec54fce7f1aaabc69d0f3fc5bb7f19a838ec00458aebce2592dc801
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f