Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4220a17e9393e34…

MALICIOUS

PDF

64.4 KB Created: 2021-02-04 08:51:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: f1d12199e0c82cf8f8a56f36ca518137 SHA-1: 2a52a3c0ed40a742f32e30a1bc513aedbc78b63b SHA-256: c4220a17e9393e341e523b76ee39af66f708ce4705b5819970ac6bae5c58de19
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous PDF links suggests an attempt to obscure the final destination or distribute multiple payloads.

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://crophysi.ru/aws?utm_term=sheetrock+brand+corner+bead+hopper PDF link annotation
    • https://cdn.sqhk.co/nilofixogezu/dPyicij/mejukino.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454694/normal_60036dedaf6ba.pdfIn PDF document text
    • https://cdn.sqhk.co/tozimozeka/ahajiRd/find_out_your_perfect_nickname_buzzfeed.pdfIn PDF document text
    • https://lanufuxag.weebly.com/uploads/1/3/0/9/130969896/64aa64597a867c.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/hgia9gj/ice_cream_cake_cold_stone_review.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460241/normal_5fe5d2bd9dec7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420459/normal_5fecef1853d33.pdfIn PDF document text
    • https://cdn.sqhk.co/gobejilu/icgcjgf/97562687136.pdfIn PDF document text
    • https://cdn.sqhk.co/nubowolimit/jstvNib/switch_nintendo_bundle_mario.pdfIn PDF document text
    • https://xixilizuxuwogag.weebly.com/uploads/1/3/4/8/134879277/muzuf-ripun-zumaxefugodilok.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/likolija.pdfIn PDF document text
    • https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/zozikopawevuj-wizupu-bulitav.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/4tigibG/navekokojaxawemibiwofi.pdfIn PDF document text
    • https://cdn.sqhk.co/vibifexode/RQrS591/wolem.pdfIn PDF document text
    • https://xomugiwonin.weebly.com/uploads/1/3/4/2/134266294/26d0c8a1.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/gudupasudaterose.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/turit.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/97681430df87768.pdfIn PDF document text
    • https://davijonixumitu.weebly.com/uploads/1/3/5/3/135349017/6549956.pdfIn PDF document text
    • https://lukenuba.weebly.com/uploads/1/3/1/6/131636916/lewumugovovetuk.pdfIn PDF document text
    • https://sobomimaseneke.weebly.com/uploads/1/3/1/3/131379860/7829596.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000bf6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 5260 bytes
SHA-256: ac7e39ae4e948473f8f352cb63cdc7ce4e5ef244cce6ef956237db83ee910aca
font_01_sfnt_off0000d13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13F 10268 bytes
SHA-256: d96770cc0bc6cb5c31c6542229eb95d48fb5ded3afe66dd674fe055fea4a8849