Malicious PDF — malware analysis report

Static analysis result for SHA-256 85bcabbe8aec969c…

MALICIOUS

PDF

77.1 KB Created: 2021-01-11 01:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fbbe6a5795f7a9fd0150d64e20ae120b SHA-1: 06ecad172e5ca0a186ba15d86075fc6e98117f9c SHA-256: 85bcabbe8aec969c9e2c70ecbb7368e2ec71f1f028a0ae5461541ad9843d9be5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'trafficel.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, suggests a lure related to an 'answer key', a common social engineering tactic. The presence of external URIs and the overall structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=polyatomic+ions+packet+answer+key PDF link annotation
    • https://site-1168209.mozfiles.com/files/1168209/29556937213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5f9d09958ef2c.pdfIn PDF document text
    • https://site-1171608.mozfiles.com/files/1171608/water_park_hotel_iowa_city.pdfIn PDF document text
    • https://site-1177862.mozfiles.com/files/1177862/splendour_in_the_grass_2020_vip_tickets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478438/normal_5fb39c0513d4f.pdfIn PDF document text
    • https://site-1178227.mozfiles.com/files/1178227/jodidugelat.pdfIn PDF document text
    • https://site-1173302.mozfiles.com/files/1173302/2540780674.pdfIn PDF document text
    • https://site-1204325.mozfiles.com/files/1204325/40305709942.pdfIn PDF document text
    • https://site-1175847.mozfiles.com/files/1175847/java_jdk_for_netbeans_8.pdfIn PDF document text
    • https://site-1175068.mozfiles.com/files/1175068/kiranefajete.pdfIn PDF document text
    • https://site-1171150.mozfiles.com/files/1171150/rcog_guidelines_bleeding_in_early_pregnancy.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/salosibejodod/fabian_rutter_imagines.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0B 5340 bytes
SHA-256: 6d48dafadf1d7a9abcd7baf4f9a8512a6f3a226297db12e6d18267cd2cea16b3
font_01_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 11532 bytes
SHA-256: 0596339a4f5103fbed49da2d42ab6af6dad90c3e638a6213eeaa542922e44c77

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