Malicious PDF — malware analysis report

Static analysis result for SHA-256 3048d58aa3043bc6…

MALICIOUS

PDF

107.6 KB Created: 2021-03-01 12:11:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: d95d4e00c733981de4502a4e2368efd2 SHA-1: 016c6f1158a0fd0fceddc0a82ce9d7388c24ef7e SHA-256: 3048d58aa3043bc6451b3a0048edbbfe800db697042b287e8a12e82f239a48bc
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm, directing users to various domains. The primary lure appears to be a 'Qmu harvard referencing guide', suggesting a phishing or content-luring tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=qmu+harvard+referencing+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ff4c82fb507d.pdfIn PDF document text
    • https://sefegoxelogip.weebly.com/uploads/1/3/4/8/134866711/3000964.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/xiwolepuzaki.pdfIn PDF document text
    • https://wuremuzagatixob.weebly.com/uploads/1/3/4/6/134612401/wilexuferix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_60030f272d1e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481684/normal_5fec6d4718431.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/lowosizubosazenamarijo4t5cl.pdfIn PDF document text
    • https://sinezotuze.weebly.com/uploads/1/3/0/9/130969777/3003776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_5fd0be33e92b8.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/991262b4233.pdfIn PDF document text
    • https://xofiwilo.weebly.com/uploads/1/3/1/4/131453946/teroxa.pdfIn PDF document text
    • https://reravojune.weebly.com/uploads/1/3/1/4/131406269/8078297.pdfIn PDF document text
    • http://badge-verification-center.com/kubota_engine_parts_manual3b7rl.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/05e94b159a75c.pdfIn PDF document text
    • http://odemebayisitrafik.com/93404861452jfv4k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pogolo/toro_sentinel_irrigation_controller_manual.pdfIn PDF document text
    • http://zaxokejik.rf.gd/how_to_calculate_diesel_engine_efficiency.pdfIn PDF document text
    • http://lekipidupi.rf.gd/bejawezukunojosubixat.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA8 5344 bytes
SHA-256: fb2ee1b579c5d45303921d93a1f76d2c44ff9e31252fd449050d419f577d5b09
font_01_sfnt_off00017db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DB8 10360 bytes
SHA-256: e4e0c3d0311ae5d2471b7e211bc49c0b038d36e581ea846f29603573728d8c8d

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