Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3512d1fa4dfb4d…

MALICIOUS

PDF

67.7 KB Created: 2020-12-26 20:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 06658019757abec09031c6d76a8e5964 SHA-1: 9934a15ffd185b52ddaacd9ceb0bb43e9295b867 SHA-256: 8b3512d1fa4dfb4d964b70278aec141a04fc9ca3133e0f498240c6435730a681
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm designed for SEO manipulation. The presence of embedded URLs and the ML classifier's high confidence score suggest this document is part of a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards a malicious redirection attempt.

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
  • 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=howsweeteats+sheet+pan+gnocchi In PDF document text
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/5112878.pdfIn PDF document text
    • https://cdn.sqhk.co/tegimatararo/hgmhiid/kuwefilowiwusezape.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f870a1a9112d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_5fbb471368d92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5fc87f043db95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459917/normal_5fa758f4864e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fbc2dd0b97f3.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/zalomi/tolifasafabuzifax.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/20282244023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10d7824-f903-40a3-b163-9821243b8a4a/su_florcita_la_banda_de_lechuga_de_m.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/dmf_forms_an_azeotrope_with_heptane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1374517e-c2ed-4393-8694-8df2c180c821/11318879614.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/pobeximimezixafedekawawa.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/21917897635.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC0 5120 bytes
SHA-256: 68ee29bff24358f50149f739d501d7456ea183a171e400d7ad1813e58aa996b9
font_01_sfnt_off0000de45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE45 10580 bytes
SHA-256: d0a823eb3d38d31c84cbfdf8cecb2462faa619a2f8e13d461b62db682be807d4

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