Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1dacc5ead1eabe…

MALICIOUS

PDF

82.8 KB Created: 2021-03-14 16:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6c277e6210769a1cbda8edde218fb5e9 SHA-1: 9f66d90bdb939587ae16ffd4bd49b5afeb99d6ff SHA-256: 1b1dacc5ead1eabe64bf966e3e4cc3bb541fd45416aaab2d1a2b1f0fe4c4434e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=sony+icf-c1pj+change+time PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448343/normal_603db0ce63bfe.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/giiachi/46928970062.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/Fzja8he/memozisulunirisobo.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/gcicLcc/85725041770.pdfIn PDF document text
    • http://7lessons.fun/xorupavunaxipomazemeqz3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_6024ef341cf6d.pdfIn PDF document text
    • http://abistrans.ru/how_to_connect_2_dj_mixers_togethercae1v.pdfIn PDF document text
    • http://winoorama.site/8114911841024t4d.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/dgdjhji/bubble_shooter_offline_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://313cea95-bd78-4864-9d9d-3b26c3bbe0bd.filesusr.com/ugd/2142af_76a73068641046f1b03c0096d7190d05.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_041e2538001040f5b29eabdae99def8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufoxorog/children_s_theatre_performances_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f51161-8181-469f-bd94-5cf7b4d2f5f7/logo_design_software_mac_kostenlos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/540c4ba0-a4a2-421b-b76d-0cd93570edba/saffire_pro_40_tutorial.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_99afa73d55154fa38825f8987c062292.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a5f231-c50c-47f8-91da-b7af971c53d4/tesemufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f500c6e0-84ba-4078-8976-f5777f814418/zefixesirujumizakuzates.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/xibesifusave.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 5488 bytes
SHA-256: 9f5f550025ded08d8bff7012714d4f9532b6fff180b4545c8acf2f760d2704c9
font_01_sfnt_off00010300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10300 10824 bytes
SHA-256: a829309bc1320925934faeb0dbf8aef43d8c51c0e3f47cec3df73c0d8ff7a500
font_02_sfnt_off0001283a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283A 16312 bytes
SHA-256: 531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660

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