Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ba2d881b331a94…

MALICIOUS

PDF

81.2 KB Created: 2021-01-12 19:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3316213014f3da66a90953ad5f9bb471 SHA-1: 6e113f3416350813fa954fd35346ce6b18ff3f99 SHA-256: d6ba2d881b331a9407548ecac5eef5c8f8564b9d18028ddc721e6705c5761a53
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 flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of embedded URLs points towards a phishing or malware distribution attempt.

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
  • 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://trafficel.ru/123?utm_term=journal+club+example+ppt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fe6fd9376d00.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/fjbdja3/homemade_cloth_face_masks_for_sale_near_me.pdfIn PDF document text
    • https://site-1177290.mozfiles.com/files/1177290/fupiwinaxoraw.pdfIn PDF document text
    • https://gafanotode.weebly.com/uploads/1/3/4/5/134576189/8c5d60770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366402/normal_5f8fea185cd22.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/ad45c4622025.pdfIn PDF document text
    • https://wafulezejo.weebly.com/uploads/1/3/4/7/134748518/kuseregokobup.pdfIn PDF document text
    • https://site-1167950.mozfiles.com/files/1167950/transmission_jack_rental_harbor_freight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_5fe9789d46045.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/4ZPb1od/followers_on_instagram_app_android.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sazixipame/ganozevuvevi.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/facebook_carousel_ads_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/anganwadi_up_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/subovalasodajomibalotev.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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 5100 bytes
SHA-256: 379d1f2bf45c0d8309bcef3a7870283d1f0af53b1861279baf95e746588d1d0c
font_01_sfnt_off0000fc0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 11284 bytes
SHA-256: 6583649aced5e649400693cc66c5a3051d9fa3161c572770e260c0c8dac23525
font_02_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 16060 bytes
SHA-256: 1018660efa6a1a00280f0dbd6ee9814149b2344b9acf14d98de2cb76d1e712aa

Open this report in the interactive analyzer, or submit your own file for analysis.