Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3089b181b029912…

MALICIOUS

PDF

83.7 KB Created: 2021-04-06 22:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 95244dc5357e45db9de23ceab94a4a12 SHA-1: 24ec280d42b00a525f9f2e9ee34967ec3c43e2a7 SHA-256: f3089b181b029912ca6d01e95b0c024f8c874c84b789e509f147d5cca7491f8f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains keywords related to a game tutorial, which is likely a pretext to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/award?keyword=scratch+maze+game+tutorial+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fde282ff33cb.pdfIn PDF document text
    • http://wojidibotetim.22web.org/bartholinite_cours.pdfIn PDF document text
    • http://bupetud.xyz/28106010318avl6m.pdfIn PDF document text
    • http://sebezedamewem.iblogger.org/quadratic_equation_examples_with_solutions.pdfIn PDF document text
    • http://tixshopclub.space/free_java_download_for_windows_vistaum91j.pdfIn PDF document text
    • http://gowitobo.iblogger.org/hitchhiker_s_guide_to_the_galaxy_series.pdfIn PDF document text
    • http://pagebake.com/epson_workforce_600_ink_walmart03v06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_600ab0c9ef914.pdfIn PDF document text
    • http://trynon.xyz/776609868196poz5.pdfIn PDF document text
    • http://pitushok.space/262447037506oll3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379035/normal_60085d5a758d6.pdfIn PDF document text
    • http://lovelyhouse.online/regular_verb_list_in_spanish79uwn.pdfIn PDF document text
    • http://albl.ru/8858341002689tp1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477658/normal_5fcd0f54727fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fc76ed620173.pdfIn PDF document text
    • http://vereffka.xyz/326136739638d8o7.pdfIn PDF document text
    • http://allfreebets.ru/7975368063747703.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5fc830ca20bcd.pdfIn PDF document text
    • http://fokefetebebinin.66ghz.com/kasaridetiteraf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455673/normal_602b9ce7baa69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josuremase.rf.gd/29994903268.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_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 5544 bytes
SHA-256: 241b310cd11008db6aaae9a6e004ae042135dda6366c8eaf89bc5ece8f86e77a
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 11248 bytes
SHA-256: 828963c0af2bf5030c52cf28e09be5ceb16ff19cb9e4475b84951758021fe194

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