Malicious PDF — malware analysis report

Static analysis result for SHA-256 4979baa24c7bf394…

MALICIOUS

PDF

72.0 KB Created: 2020-11-22 17:20:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8d7ae3976bdd5e83d9f84a5e4ce7aa1d SHA-1: b1790cf93eee8c5961ee98172175e56a86e3aa99 SHA-256: 4979baa24c7bf394480914f8637d9f4f91b5af58173843108767fd3fa4c0b746
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The presence of a large number of external PDF links, many pointing to SEO-optimized content, suggests a link farm designed to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the PDF structure and embedded URLs point to a phishing or malware distribution scheme.

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://traffine.ru/123?utm_term=mew+ichigo+strawberry+bell In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368488/normal_5f8fe0f0a34a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424043/normal_5faf89ef21b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_5fad3c4090acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385230/normal_5f90fa11de59c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383915/normal_5fb2e3ffc19c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419218/normal_5fb447b36d151.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/babovidavut_puxoriropibadol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5fb019450b176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5fb694d8355f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_5f9ed74decafe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_5f980b4d84204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f923ed50b8c3.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/lodazojamuva/26583444677.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/wekesirufo.pdfIn PDF document text
    • https://s3.amazonaws.com/kisagoz/psoriatic_arthritis_treatment_guidelines_2019.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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 5400 bytes
SHA-256: 1eacdfc50172f7a1977c20acb28a04f7326be3dd9fa34bc4d1bcc541101a1290
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 9952 bytes
SHA-256: f8bdaf52270108ce7e656210bab5e01c122aab8169ef6bdcc30e51c4f0d11f63

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