Malicious PDF — malware analysis report

Static analysis result for SHA-256 6949c400c2f37214…

MALICIOUS

PDF

68.2 KB Created: 2020-11-23 12:56:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: df6098e6f07a145c1932bf2e9f8eaaad SHA-1: 5488d5bf73574aeef3c1891451af6b5bc4d89a48 SHA-256: 6949c400c2f37214ebf3df2660f7daf3424344ccc03a1a3cc2ed60ee0a641035
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, many pointing to external PDFs hosted on disposable domains or potentially malicious redirectors. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

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.
  • 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.
  • 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://gettraff.ru/aws?utm_term=chalice+of+opulence+rune+guide In PDF document text
    • https://gebopudexor.weebly.com/uploads/1/3/4/4/134482947/lurilovuk.pdfIn PDF document text
    • https://kodowogokilikid.weebly.com/uploads/1/3/4/4/134466607/bfa10b32244d25.pdfIn PDF document text
    • https://zeziruxowajud.weebly.com/uploads/1/3/4/6/134698921/munuxojuxatamevevok.pdfIn PDF document text
    • https://dodimugu.weebly.com/uploads/1/3/4/4/134483739/galawagawetek_zolufenogi_vegizikov_zubozibusuko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372707/normal_5f8d6622a90b6.pdfIn PDF document text
    • https://difomojixi.weebly.com/uploads/1/3/4/3/134319012/70ae92b27c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed89a2df-70c3-4957-920f-acfad8b62ec9/25737856972.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/ruwotifijiwufowojis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58adcfe8-11a6-4b42-98e3-e7f441056719/nitya_pooja_vidhanam_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e1528af-d82d-4732-aee7-faf0c6adb1c7/pact_primeval_d_d.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623f1a95-e831-47ff-ab5e-231c251c607c/the_art_of_seduction_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4582e90-2a18-4b86-a238-6d5f3c8f6286/nukoruvilaranivotezug.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_off0000d0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AF 5144 bytes
SHA-256: a45ce45fc1e7eae1d73ff9406cbeba2f443554c2d75c83becdeb90ea6ee7e1bc
font_01_sfnt_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 10200 bytes
SHA-256: 311f6ec9f4de51ba275c01f0b5c1c815f87682656b1b3fa823a25bb3c9e87139

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