Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9f188d0910e7f3…

MALICIOUS

PDF

62.7 KB Created: 2020-12-17 04:48:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9e51b71cc71d51f83eee5e2eccdcdaaa SHA-1: 3b6f8e14e052fc60f98baa81b9c18d4a0e26d3b4 SHA-256: 8b9f188d0910e7f39f8a9902ce85fc66917f7f183d3c3ead1e32ee8d950fbee1
242 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of embedded links, with critical heuristics indicating that many of these links point to known malicious redirectors or are part of a link farm hosted on disposable infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan. The primary attack pattern involves luring users to malicious websites via these links, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9618

Heuristics 5

  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=variables+on+both+sides+worksheet In PDF document text
    • https://xovadesunuzavam.weebly.com/uploads/1/3/4/4/134479636/dikelikuvitok-zupuxi-zopola.pdfIn PDF document text
    • https://bujetukojijem.weebly.com/uploads/1/3/4/8/134875379/tixewikas.pdfIn PDF document text
    • https://gewupokisata.weebly.com/uploads/1/3/4/6/134606569/1981d4c4ed.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/tobexemela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f99d2570f8b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452837/normal_5fa14927b7375.pdfIn PDF document text
    • https://fineruliji.weebly.com/uploads/1/3/4/3/134313455/0c6706e399787.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/333c6647-e1e5-4876-9339-038afcf536af/jogekegegubemonotosumup.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1321e2e34347c7045f8f9/t/5fc99f8bbe6684539de4f166/1607049099653/12971239766.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/gluten_free_pasta_sheets_morrisons.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5ce31d26ff1194f9586a7/t/5fcbf29f260a660a6bc47256/1607201439330/mowokozawewe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/748511a2-bae5-4d9d-aa79-a1cf30ab4f12/ravenfield_beta_6_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9fe489-bd77-4923-9efa-5424da73a32a/teachtci_lesson_game_answers.pdfIn 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_off0000b9e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E8 1820 bytes
SHA-256: 57ab38865ee73357087601920545677cf4a6735b7f7a8e22015f7835e3cda69e
font_01_sfnt_off0000c270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC270 5172 bytes
SHA-256: ce8a187e33330c5bc648f24b49fab96b560717a7ee6b53fa40e77f6b09a0ac21
font_02_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 10684 bytes
SHA-256: 1d3befbe0650820dec8df9249d6e61b423dd6f9b6a75322765084029b1355e24

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