Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1a6d504923413b…

MALICIOUS

PDF

64.7 KB Created: 2020-11-14 03:38:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df171970ed6fc6d6162e6d150c6b1ecd SHA-1: 6f5c3a400993075c00d3c3b93c16776631a203c0 SHA-256: ca1a6d504923413ba4bca685d10a234ee7611fe47d2c750e993f28d7f076376b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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-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://traffking.ru/aws?utm_term=create+checklist+form+in+word
    • https://cdn-cms.f-static.net/uploads/4502870/normal_5faf29d49faa4.pdf
    • https://cdn-cms.f-static.net/uploads/4372673/normal_5f90df6f3a786.pdf
    • https://cdn-cms.f-static.net/uploads/4404293/normal_5f9962e17bb6b.pdf
    • https://sosegesidor.weebly.com/uploads/1/3/4/4/134465043/lanenuzomanuzutetuv.pdf
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/pomilezizolibo_kitarusatibu_seren_loxufagezir.pdf
    • https://xovelojedawoka.weebly.com/uploads/1/3/4/6/134662979/nebelate_jefadejenamoxoz.pdf
    • https://nogegonimever.weebly.com/uploads/1/3/4/3/134340032/witodatojukipi.pdf
    • https://xuzelakojit.weebly.com/uploads/1/3/4/5/134593048/tatise_jukigonusuj_vadodabidiv_tidewuvofususi.pdf
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/6781803.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8ca03f0c-63a5-4a19-ab4a-0e394cc8a648/ada_county_jail_boise_idaho.pdf
    • https://uploads.strikinglycdn.com/files/3cbd30bd-7b37-472c-a50e-c5b684aab2a1/manualidades_con_periodico_paso_a_paso.pdf
    • https://uploads.strikinglycdn.com/files/aa8a4da5-9712-469f-8199-e09b3e1f0ca5/5635316936.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_off0000c29c.bin
136d678dc603d4407bcf8e4814c02bb47a7a72e71fed0248a6bb274387878cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 5324 bytes
font_01_sfnt_off0000d498.bin
e9ef0f0ab597588ecfa975eb50fb0f5460e36fcbd52551f0ce00b70641b02fdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD498 9976 bytes

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