Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ff2212459f50c22…

MALICIOUS

PDF

76.6 KB Created: 2021-02-11 17:39:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2960f7e76374274b5b6574cb17e7f629 SHA-1: da733bb6f3a94d09231b108a59c94bf1aed9b12f SHA-256: 4ff2212459f50c22d10fb3f963a8981a5ce1d8fad3f7f6d2cfd9c01a6662244c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'bologen.ru' and another to a link farm heuristic, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

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://bologen.ru/123?utm_term=aacp+2020+psychiatry PDF link annotation
    • http://animoney.xyz/protective_relaying_theory_and_applicationslpiof.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/eZ8gfgc/mojamuritedan.pdfIn PDF document text
    • http://avtoshtorki.shop/73093887226n15bz.pdfIn PDF document text
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/6217877.pdfIn PDF document text
    • http://astropsychology.site/mafia_city_cheats_without_human_verificationn46ve.pdfIn PDF document text
    • https://cdn.sqhk.co/pananumujo/Jjdhhif/in-_q-_tel_australia_ltd.pdfIn PDF document text
    • https://cdn.sqhk.co/jimumakevaji/cMEgZhj/pc_shooting_games_download_free_windows_10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411483/normal_5fdd183e47bd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466680/normal_5fe55248f0d43.pdfIn PDF document text
    • http://honey-love.ru/yamaha_rx_v373_best_settingsch1wz.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/xabalaru/cool_animated_wallpapers_for_android.pdfIn PDF document text
    • http://xijixabomama.rf.gd/jekitixavidaxipo.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/ophthalmology_clinical_vignettes_pemberton.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/jivaxiduso.pdfIn PDF document text
    • http://nanixalo.rf.gd/bepazomupi.pdfIn PDF document text
    • http://xoxepilazif.rf.gd/variable_control_chart_excel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/gakijedepigupugi.pdfIn PDF document text
    • http://kajifota.epizy.com/vce_to_converter_app.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_off0000ed8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8C 5352 bytes
SHA-256: faed3f18ba84ad92a008a3ad20eefe9c06e82b70d34591e57145a54e38e5df5a
font_01_sfnt_off0000ffc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC1 11068 bytes
SHA-256: c198146acf443c043f70520eab6be923194a075d2906e79fa2ed3515a1fb9c37

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