Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e6446377017049…

MALICIOUS

PDF

78.7 KB Created: 2021-01-18 02:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9799e88713ade32e6100e78d456a8306 SHA-1: 870a99c7d36bceb5a2670621dcfbcbe0ef7eccf5 SHA-256: 31e6446377017049560f71265fe4db6b43bc07a5a1e1012d01455c20b323ccf0
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to search terms, suggesting a lure to a malicious website.

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://traffset.ru/123?utm_term=peacock+wedding+dress+most+expensive
    • https://site-1166617.mozfiles.com/files/1166617/18630273126.pdf
    • https://site-1211292.mozfiles.com/files/1211292/ralejib.pdf
    • https://site-1177392.mozfiles.com/files/1177392/berimipeles.pdf
    • https://site-1244485.mozfiles.com/files/1244485/back_titration_method.pdf
    • https://site-1168252.mozfiles.com/files/1168252/ladybug_adventure_run_play_store.pdf
    • https://site-1172851.mozfiles.com/files/1172851/ice_hockey_training_aids_uk.pdf
    • https://site-1171754.mozfiles.com/files/1171754/74120033184.pdf
    • https://pamukisap.weebly.com/uploads/1/3/4/7/134761215/jiripafo.pdf
    • https://site-1174882.mozfiles.com/files/1174882/fokanufivema.pdf
    • https://site-1177743.mozfiles.com/files/1177743/pizarolaraluzizikif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pesetufavo/calculating_capital_expenditure_from_balance_sheet.pdf
    • http://zuxekesimulir.epizy.com/another_day_without_your_smile_song.pdf
    • https://s3.amazonaws.com/xiwevitox/performance_appraisal_officer_job_description.pdf
    • http://sobibuxasegisun.rf.gd/invitation_templates_app.pdf
    • http://lajirobodogew.epizy.com/significant_figures_and_rounding_off_worksheet.pdf
    • http://xeravujowa.epizy.com/nodinetoteb.pdf
    • http://wiwifiladovov.epizy.com/63126489843.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f705.bin
fe1fdede4b3d6fef71d6a6dd2cb45ec96758304dd2cb6d2809d1b1b985177719		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF705 5648 bytes
font_01_sfnt_off00010a4c.bin
142d42c9de26f16d39e8d915e0f12ac1c9cdc77a9b8fb7301dfe6b085ece6b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4C 10460 bytes

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