Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7d39ff2d5af848…

MALICIOUS

PDF

72.4 KB Created: 2020-12-17 04:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3879f0824163823881ebfbb8a4066b09 SHA-1: e665fbe97bad6fe16d81dc995e4000e919ba57aa SHA-256: 2e7d39ff2d5af848bea3b1b9606bcd8c4b029a7b0d7533b8aed112370f633d19
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, with one heuristic specifically identifying a 'PDF link farm'. The primary suspicious URL, 'https://traffine.ru/strik?utm_term=r+and+s+enantiomers+of+warfarin', suggests a potential phishing or malicious redirection attempt. While no scripts were directly extracted, the PDF structure and the presence of numerous external links indicate a malicious intent, likely related to driving traffic to malicious sites or hosting further malicious content.

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://traffine.ru/strik?utm_term=r+and+s+enantiomers+of+warfarin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454973/normal_5fd1e2b3ac6fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fcb78be69102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466689/normal_5fa331321ce8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417118/normal_5fa0d1850941b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f874ceecc4ee.pdfIn PDF document text
    • https://jonurimexiv.weebly.com/uploads/1/3/4/3/134321783/zopix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/54140740-229b-4cf2-8f9f-dc48cbf1c7b1/metapirabojoni.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/bandslam_soundtrack_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02762060-ed6b-44f4-ac3a-ef11d8d8ba54/20444349369.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe273061e25426e1028b04/1606297393305/fetolenenijubijez.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/free_animal_jam_membership_codes_2015.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f9eaa3bf4b14abb69cf4/t/5fc6ef576beae45431588a58/1606872919591/cooking_crush_madness_crazy_chef_cooking_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5576817-d491-4ccc-a30e-a1f4b9e2b1d3/swords_and_sandals_2_hacked_skill_points.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fb60c30a162e0c601609/t/5fcb6bef1ef6d1662fee4dd6/1607166967004/14705977184.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE5 4908 bytes
SHA-256: 826f2deb3b177d1656db8a7397648b763a807c9f61dd63f58382e616d7afd2a6
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 11676 bytes
SHA-256: 0bee9ae06ca1c5fd9e015e63166175ffe4f361f63bbcbe735c3bbdd24d1c7c11
font_02_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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