Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f91a7cdc47de9e…

MALICIOUS

PDF

75.2 KB Created: 2020-12-20 19:41:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ae4f2a5234a60198ff681cd0d2d77a2e SHA-1: 9766e6958cf3a041aa9189f9f6887df65e579c87 SHA-256: c1f91a7cdc47de9e9dae1394430127acfcf4e4462f1de002b732efaafc027e05
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm or phishing lure. The primary malicious URL identified is trafffe.ru, which is likely used to redirect users to a phishing site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://trafffe.ru/strik?utm_term=pltw+activity+3.5+applied+statistics+answer+key PDF link annotation
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/7442338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368777/normal_5fc4d9ef9ead6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391047/normal_5fc901bc8b3b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365583/normal_5f8cfcd92baa7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5fc47e09ef431.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402014/normal_5fce7d63d1afa.pdfIn PDF document text
    • https://sixonawujow.weebly.com/uploads/1/3/4/3/134369174/5213406.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fcfb1bca1dd9.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/growth_and_fixed_mindset_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/87262332336.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/gmp_certified_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f482d6-6491-4f1e-b38d-05a778b17349/working_papers_nj_every_year.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000d4b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD4B6 11256 bytes
SHA-256: 937a9d761fc5a4aa05cae1e1d53d94c2efa1cf598f171eebd6f3616b7b2cd20d
font_00_sfnt_off0000c11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11E 5708 bytes
SHA-256: 9130ef6f041fe04fc7fa8f808573278f91c40008f72e28ba73eedf02ac8e8145
font_02_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 12132 bytes
SHA-256: a06125e8e648f21624fd58732fab7718bd201509c8fef725fe60a37da78a1d3d

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