Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd5e4e201c00f95…

MALICIOUS

PDF

83.6 KB Created: 2021-05-28 23:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8a42da515d5a1b09872f13258de8654a SHA-1: 1fa802e326fdf7fba1764e491c53cd5aaa4c7c7a SHA-256: 9cd5e4e201c00f956741973ec072777309d8f9e1b1e4007245e2539f90221b7f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=jee+advanced+b+arch+question+paper+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446045/normal_601cdf8945415.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_6057c393d1e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462714/normal_6054bd9093fd8.pdfIn PDF document text
    • https://guxodovuze.weebly.com/uploads/1/3/4/3/134333652/sokukoz_pumogi_raguluju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_6053a7bd49fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_605c0b4a50116.pdfIn PDF document text
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/351342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416805/normal_60329535ceb0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485710/normal_6056864b5f424.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/eb4890a4-6729-4958-ba8a-8af12381b9fa/what_are_computer_parts_and_their_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec04e45-5b93-4e8d-9bd7-4d3062867ee1/14448095804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3741ad23-7ce8-4833-9264-43022583f6ab/fexebijelutorodaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a83529-ede4-4e7e-a2d6-8fe8c6716c3b/36552691489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfa72230-bb0f-4833-a820-ce3aac299eed/honda_rebel_1100_engine_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba89cefd-d1de-4a4e-97b4-370d4c656c27/velozes_e_furiosos_7_filme_completo_dublado_em_portugues_assistir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9c0b14-3cdc-4091-81f1-e0195d9e18bd/bohemian_rhapsody_chords_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32cb829-1e63-4174-8331-442ce501329d/how_to_get_tinder_gold_discount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702fbda4-3f84-4249-ac6d-9add9d79540a/92037446303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/465021a6-898a-43c0-92b2-672f6061ec73/how_to_make_a_legal_memorandum_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd312b6-7516-4b52-b128-9b60b29daa08/fatuzilalibosasizuganabe.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_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 5524 bytes
SHA-256: 57ba40ca17e775caf452bc82a7d2f839a13d1687650a23a01045022efe300d3e
font_01_sfnt_off00011b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3A 11124 bytes
SHA-256: fea2762d06a4967b2d141f39cf928703e91fad26dca37c02153e420536942fe3

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