Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3ba3fd15792416a…

MALICIOUS

PDF

73.0 KB Created: 2021-01-19 22:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 725154f3549a03eb5c72eb663edce7f0 SHA-1: e28d0e417712288a26466d3616a4edda7691d69a SHA-256: b3ba3fd15792416a8e6c12d2e46b77b0d9df071d660fff6779db818a558975c6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm used for SEO manipulation or to distribute further malicious content. The embedded URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=david+brown+990+manual+pdf PDF link annotation
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/c7d167aba37.pdfIn PDF document text
    • https://xisevulatunetu.weebly.com/uploads/1/3/4/5/134595014/1869368.pdfIn PDF document text
    • https://site-1171954.mozfiles.com/files/1171954/green_new_deal_summary_fracking.pdfIn PDF document text
    • https://site-1176145.mozfiles.com/files/1176145/20447164193.pdfIn PDF document text
    • https://site-1168007.mozfiles.com/files/1168007/79038054371.pdfIn PDF document text
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/mobaxupubofe.pdfIn PDF document text
    • https://zokejiwiperasuk.weebly.com/uploads/1/3/4/6/134668939/defisu.pdfIn PDF document text
    • https://site-1172757.mozfiles.com/files/1172757/28086731489.pdfIn PDF document text
    • http://nutupiwerumad.66ghz.com/gta_5_cheats_pc_apk.pdfIn PDF document text
    • https://site-1171454.mozfiles.com/files/1171454/75769988531.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/petikamov/54106459865.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/lixaj.pdfIn PDF document text
    • http://matogojetize.rf.gd/tabap.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_off0000de29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE29 5600 bytes
SHA-256: 5ce496ef952418342a54cc762e2a5c824f399689d244ce5d5798d860b3f815d9
font_01_sfnt_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 11600 bytes
SHA-256: 7d5335c8821ffb9ba62dbb12665c60547082e27126d5702cb26b0ddc37c3f8ad

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