Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b280d193739a60…

MALICIOUS

PDF

71.5 KB Created: 2021-01-03 23:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 358aac522dabfcdcfdbc260d1564f6ff SHA-1: 2d7b07c4cea3b39c982ab0dbd5d9a6218becbd2c SHA-256: f5b280d193739a60d6f532b0a451f9e0ed109646d6ebd9c290419a2a1d93ee50
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://gettraff.ru/123?utm_term=predicate+nouns+and+adjectives+worksheet'. This indicates the document's primary purpose is to lure the user to this malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL is sufficient evidence for a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=predicate+nouns+and+adjectives+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5f9f31f43fde5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_5fd29a7b27ad6.pdfIn PDF document text
    • https://cdn.sqhk.co/vufisolepu/gcha4ij/4967430672.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/Zjjiagh/rajura.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/bbcab0b7-8a61-45dd-bace-5abb8fc8ca11/color_castano_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/11627459530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62dfc35e-203f-4837-9b92-50037432bbd4/nenotodogexidixop.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/15358694253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/857181bc-f31a-4d32-8e9f-9e66ad6a0969/nonuzelin.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/lumugules.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/14112955046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34e186fa-054b-45d9-ab74-254c61b801df/19967351423.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/invisible_character_copy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd5ac5e-55a0-44f8-b931-8dc2e3798b94/what_episode_did_danny_and_sam_kiss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540f725b-456e-4cff-990e-1bb71f3c04d2/44718667398.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/wobopirotiwaraxekixude.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

Related samples 2

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8B 5168 bytes
SHA-256: c37447132083fd46965852c78bab7b7d474c56d849420eedc1667eb1704c5534
font_01_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 10284 bytes
SHA-256: 268b372d172a65c598753009c2c39fd4a9b28efcd6c5b73587ecc00b978515d6
font_02_sfnt_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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