Malicious PDF — malware analysis report

Static analysis result for SHA-256 405bddedf08dfee0…

MALICIOUS

PDF

76.2 KB Created: 2020-12-26 01:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5e415a33f5163204dd051243c2af89f0 SHA-1: 98421897952163e0e282106927f1a16bac72deb0 SHA-256: 405bddedf08dfee0e0dbf07823928efaf62f1f9cd60873c8fa04fb0289c7d0b0
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of links suggests a phishing or malware delivery attempt, likely initiated via spearphishing.

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
  • 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.
  • 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.
  • 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://traffmen.ru/aws?utm_term=wallpaper+hd++jio+phone In PDF document text
    • https://dusomekekonipa.weebly.com/uploads/1/3/4/5/134580960/d10bc.pdfIn PDF document text
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/lituj-mogowoxuk-tuxojupoje.pdfIn PDF document text
    • https://nemulokisen.weebly.com/uploads/1/3/4/4/134492012/8854803.pdfIn PDF document text
    • https://vibebivenef.weebly.com/uploads/1/3/1/4/131412032/171919.pdfIn PDF document text
    • https://gebaxugore.weebly.com/uploads/1/3/4/5/134594027/xatatonugavuxemam.pdfIn PDF document text
    • https://vimijalubatek.weebly.com/uploads/1/3/4/7/134739875/zugirokawubeg.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/12f6ba4f-d1a7-492b-b3f4-1c073b0e06a7/dont_stop_me_now_piano_sheet_music_musescore.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/34325192867.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/leveson_report_executive_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c9da260-ca30-4cf9-925e-9eb7df83fbff/tactical_droid_star_wars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8da1896-09de-479b-9b6f-880578543b4b/vorokasagatidavum.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_off0000e0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BE 4668 bytes
SHA-256: 776be32e2b8584a13dd141ebdb64e4e99335aa14b0fe4e07cf0fc7ac796432f7
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 10980 bytes
SHA-256: c9be73fbbeb6e122e766f9510a6f28a0ac0248a7111165679d7fcc03dc73a1e8
font_02_sfnt_off000115fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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