Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b327c67464dabb…

MALICIOUS

PDF

75.8 KB Created: 2021-02-10 23:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7721ab15c9d483084bfe3811ead9a05f SHA-1: 841cdd69e185ff58b0e67d814add0cd137efc303 SHA-256: d6b327c67464dabb10d30eac4c5def557186884b401c8c474d42dbcb66621e6a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a movie title, likely serving as a lure to entice users to click on the embedded malicious links.

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://maypoin.ru/123?utm_term=the+amazing+world+of+gumball+movie+2 PDF link annotation
    • https://cdn.sqhk.co/buxifuludo/Uic6Zmx/52188012042.pdfIn PDF document text
    • http://pedalini.club/biminukobokulurodikiryq5z.pdfIn PDF document text
    • http://sushibara.net/45008155697qk9b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_60215456375a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_600a7a04ae2e7.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/Uge9gj6/flip_rock_and_roll.pdfIn PDF document text
    • https://nitevafatuva.weebly.com/uploads/1/3/4/8/134872456/dixapatad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_5ffce390b64a3.pdfIn PDF document text
    • http://wisecredit.info/happy_wheels_free_full_gamed8ji5.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/sipunolibu.pdfIn PDF document text
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/98ba9d.pdfIn PDF document text
    • http://callup.today/dream_league_soccer_2019_vs_fifa_mobiletqfwn.pdfIn PDF document text
    • http://geniusenglish.space/soxisayf0xy.pdfIn PDF document text
    • http://gnatural.space/legends_never_die_piano_sheet_music_easy4sf4b.pdfIn PDF document text
    • https://ziwagunu.weebly.com/uploads/1/3/4/8/134883986/suvitipuguto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_600a218da47c3.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/6661026.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
    • 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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5368 bytes
SHA-256: 45495344d6acce0c09dbc877cff2b326de4adca5736165680f6710afe364dbd2
font_01_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 10608 bytes
SHA-256: a13b5c2b85abb9fecdef90b0a696f56f66c5f7f3f1fed4954684292dedae34e5
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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