Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f111de22d2debab…

MALICIOUS

PDF

72.5 KB Created: 2021-03-11 16:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bcbfa7fa3739ca0b37fa584fcd8db8f8 SHA-1: a48b5cde99da23bef03a917637c107ecee58f984 SHA-256: 3f111de22d2debab1dedd48c58f363be087bcc36d2303d73d10525369a869851
126 Risk Score

Malware Insights

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

The PDF file, disguised as information on hydraulic actuators, contains numerous embedded links pointing to disposable domains. This behavior, combined with ML and ClamAV detections, strongly suggests a malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/award?keyword=types+of+hydraulic+actuators+pdf PDF link annotation
    • http://pogibofabut.getenjoyment.net/28074920813.pdfIn PDF document text
    • http://mowewuwopirot.iblogger.org/atlas_game_fishing_guide.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/cb3b7d83fe56ba7.pdfIn PDF document text
    • http://xixevogaxazi.22web.org/taco_bell_chicken_power_bowl_calories_without_guacamole.pdfIn PDF document text
    • https://bazamafew.weebly.com/uploads/1/3/4/0/134016738/zamosuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rodedewezijore.atwebpages.com/repulomaxajeraguvekoputaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeb6cf9-6533-4825-b74b-13bb4e95b8d6/1001_albums_you_must_hear_before_you_die_complete_list.pdfIn PDF document text
    • http://mepuzoxol.rf.gd/gataxotikutirikijamaparo.pdfIn PDF document text
    • http://xegeduv.rf.gd/18893248460.pdfIn PDF document text
    • http://zulugeka.rf.gd/66015648045.pdfIn PDF document text
    • http://gixulomo.rf.gd/30312238975.pdfIn PDF document text
    • http://bejuxufuvojofa.rf.gd/hot_dance_dj_mix_song.pdfIn PDF document text
    • http://xirotowukutizu.epizy.com/antihistaminicos_pediatria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd45391f-07f2-4a03-8e8b-fc2fb5f357c2/matixu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e4f8a3-271b-49fb-b029-8ee3e6c67266/89528111864.pdfIn PDF document text
    • http://bigisewolax.epizy.com/bejorutigonuxomemubov.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_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 5296 bytes
SHA-256: 8cebb64440ffeaf856ffbdd0a90be66ad85bc1fea2be2511870ad99845d76011
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 9856 bytes
SHA-256: 9bf22616414dab05676fe84bbd1deaac8b27b8cc6fb8f4614e59a568b39b68a8

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