Malicious PDF — malware analysis report

Static analysis result for SHA-256 2352a6dcb10b22de…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 19:17:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f18095541035ff1c8baedcb30fb3b34f SHA-1: 1586c7b8812e200d9f9a028b3c3a30628c9739fa SHA-256: 2352a6dcb10b22de44752b73f0f17e4a6fa27d5c1ce3f1f7a67d5fbee1473e96
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external URIs pointing to disposable domains, suggesting a phishing or SEO manipulation scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=company+logo+quiz+pdf PDF link annotation
    • http://idealicaitaly.site/hicare_pest_control_services_bangalore_karnataka6k5so.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/RZt051C/defender_90_soft_top_installation.pdfIn PDF document text
    • https://cdn.sqhk.co/bejamisokepu/id1jibG/jubulapotazesezunaseben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403951/normal_603b5d2ae781b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_6035ec09d2b91.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/ijjij9X/hip-_hop_music_meaning_in_english.pdfIn PDF document text
    • http://lg-supportteam.com/4305640309930y8o.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_059f368be6754ab9a79ab618f5a11b75.pdf?index=trueIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_4f463e092e9a4ea9aec78dee43be3d36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccc44fef-8cc3-4732-88fe-b734eb6dd040/naxiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c3de55a-ece7-406e-8e91-9ae267320821/78035935966.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_d3b26dec571d41d0a171d47d6c150040.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89e5a0d-8941-419b-bc04-9bed4e43f5c8/30571609381.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_99a4de6837d746bba071ae1258995811.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_501199b391f149e796652caf5cb92b6d.pdf?index=trueIn 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_off0000ec30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC30 5268 bytes
SHA-256: 01897c07a860837a415d430ef685050aee2d0a899c0846b04d0b9de226f2a92d
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 11816 bytes
SHA-256: 9c86029e892f1ed7b664506b5bdd296106d1abef74cc60976cdd786969caa794

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