Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8aabb88b3171b8…

MALICIOUS

PDF

91.1 KB Created: 2021-03-21 11:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dfdc8592952323b612ac74ec8d6fafc8 SHA-1: 24ee855c6af12d7ba8ca8e5dbd3279d1962dc30b SHA-256: eb8aabb88b3171b82387126d096ead769e510301ba360df7e8d95702eb4b297a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one prominent URL leading to a site offering 'free html css templates'. This suggests a social engineering tactic to drive traffic to potentially malicious or ad-filled pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pelibifir.ru/123?utm_term=free+html+css+templates+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368971/normal_604def1480f43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_6022bbda4175f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465149/normal_6020ac3852239.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_60336132432dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488130/normal_600b3c201a12a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_604b7151bf9bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407813/normal_6041c31ac6143.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/hhaO2d4/saxomugipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_601d0267a6f5b.pdfIn PDF document text
    • https://cdn.sqhk.co/xawobovuji/fRM0mTj/passcode_lock_screen_turn_off_time.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_6048fe56531a3.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/er6hgjj/juguletijuxoparejolus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fd8dd6954d2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_60472678ef824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447649/normal_602e335a4f8a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459318/normal_60004b83711f5.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/i4ifzhb/lefivoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443342/normal_5fd844f93740d.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/sESBdjd/75213412578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462046/normal_600277ef13924.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://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_48ea4af80b14421785d5852863f2192f.pdf?index=trueIn PDF document text
    • https://ced6af22-cf5f-4df0-9cd6-2d424634d287.filesusr.com/ugd/3eed2b_b7472d0fe9f0422fa6aa0478a305e8e8.pdf?index=trueIn 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_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 5172 bytes
SHA-256: f3c1bc74a95e7a764b301afae1fe8a991182969abe1116de34befb4c92cd23bb
font_01_sfnt_off00012b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4C 11104 bytes
SHA-256: d96f79a9011a47326a104397d30949a3e284dea750df84af39bd7c0ac94165c7
font_02_sfnt_off00015130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15130 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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