Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8977b31c28a8709…

MALICIOUS

PDF

68.8 KB Created: 2021-01-14 11:30:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: f71328082d4a9c9e5c980b09522bbc9e SHA-1: fb7ac52d90b70ca7231dabd4dabf09c1c29c2640 SHA-256: b8977b31c28a8709d4e75d44046948de187a2c83e1ea61a826c8d0ed0e0faa75
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating malicious redirection and link farming, including links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve as lures to phishing sites or malware downloaders, aligning with a spearphishing attachment attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://traffmen.ru/aws?utm_term=shongwe+and+khuphuka+amazulu+avumile In PDF document text
    • https://xetutimi.weebly.com/uploads/1/3/0/9/130968997/wenamume.pdfIn PDF document text
    • https://site-1168173.mozfiles.com/files/1168173/pikutaxulajozejudi.pdfIn PDF document text
    • https://site-1168511.mozfiles.com/files/1168511/startpage_review_2018.pdfIn PDF document text
    • https://site-1174202.mozfiles.com/files/1174202/99831156000.pdfIn PDF document text
    • https://site-1172855.mozfiles.com/files/1172855/45193095272.pdfIn PDF document text
    • https://rugajasaxi.weebly.com/uploads/1/3/4/0/134096424/cd4a1e98dc55.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/rebomedug/mera_murshid_ali_maula_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/medadele/one_step_inequalities_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/recycled_asphalt_pavement_advantages.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/nejedipun.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/dyplom_z_jzyka_angielskiego_dla_dzieci.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/lunakedojafolimugebipukuw.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/electrical_engineer_job_description_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/aadhar_card_size_in_word_format.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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 5268 bytes
SHA-256: a232d4161799e54916573bd0b9e6aeea03a7a5a738c59ed8182808859f0e5a3a
font_01_sfnt_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 13516 bytes
SHA-256: 6443ebd2be93af37633ef05f59d5d79d8b3ce0d9d93833f913a743828cc7e8ae
font_02_sfnt_off0000f817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF817 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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