Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8edba9e6fc147d…

MALICIOUS

PDF

70.2 KB Created: 2020-11-23 16:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d34d6ea6fc5f1a28242ca4d9f89197ae SHA-1: 7efb7a2c2ca0548f0091a4f0e6aab5272472e65f SHA-256: ca8edba9e6fc147dd2ed1ea43f43fa60c2d8e9d51f0a9a4d7cdd6e98bc609aa4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The document contains a link farm with numerous external PDF links, including one that appears to be a lure for 'nintendo ds emulator download for android'. The presence of multiple external links on disposable hosting suggests an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

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://trafffe.ru/strik?utm_term=nintendo+ds+emulator+download+for+android PDF link annotation
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/9863831.pdfIn PDF document text
    • https://gerorajowivorem.weebly.com/uploads/1/3/4/6/134686153/d346441b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f908b853285e.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/bedomamusuvafoj.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/c4e69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_5f958cb9762bc.pdfIn PDF document text
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/1d8c89f3e56.pdfIn PDF document text
    • https://tanifovekula.weebly.com/uploads/1/3/1/3/131379991/xalupesivile.pdfIn PDF document text
    • https://jawogebewo.weebly.com/uploads/1/3/4/3/134369376/tebobanibewid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fa296e60d321.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5919eee-56ce-4a05-a0c0-92f525241382/cuestionario_familia_kinetica.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84141e5-a214-4082-bb74-f9fedee30ef4/59274064361.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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 2968 bytes
SHA-256: afcae459a23cd8fad60e71fa482ed795063b178ca7a96d5a337757ed3e51a98b
font_01_sfnt_off0000cc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC33 5116 bytes
SHA-256: b4ebd899c8db3ec583e64c403133e1a2232545fa24873fcdb7b1b4541d3f4a91
font_02_sfnt_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 13768 bytes
SHA-256: 146a1c122029e3b61ea1c7e2f3490b6231240c785466c362b3e094495230fb1b

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