Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d328d799ad1978…

MALICIOUS

PDF

79.4 KB Created: 2021-03-19 22:39:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a3cb81cc307979451ab7a6b85a19e653 SHA-1: 8bd4d4f54bfb2731829471c9efb56d4e17ab1ba1 SHA-256: d3d328d799ad197860770b1294ee9904e5f3ceaaa8c21396d93afe12070b429e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to study guides, indicating a deceptive pretext for directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=anatomy+and+physiology+study+guides+free+online PDF link annotation
    • http://unreguezff.rest/weak_and_strong_adjectives_exercisesemmby.pdfIn PDF document text
    • http://gagogepatajebe.medianewsonline.com/jiwivusuxew.pdfIn PDF document text
    • http://velesvoyage.ru/39164774279rcnpo.pdfIn PDF document text
    • http://shoop-fg.ru/how_to_adjust_humidity_on_airsense_104p4fn.pdfIn PDF document text
    • http://static-start.top/where_is_the_battery_on_the_roombazkr9p.pdfIn PDF document text
    • http://montana-media.com/30899902535u7nmh.pdfIn PDF document text
    • http://vatojaginasi.22web.org/answers_for_math_test.pdfIn PDF document text
    • http://usacreditmonitoring.info/kewavivaxafynzdm.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/fugigekenoxu.pdfIn PDF document text
    • http://tersq.fun/kakomegopumedilj3gvh.pdfIn PDF document text
    • http://wildber.store/10549039866s68so.pdfIn PDF document text
    • http://instapriz24.site/bebunimubupifemefdtmt3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webataj.epizy.com/audit_report_of_reliance_industries_2017.pdfIn PDF document text
    • http://telatojewoka.epizy.com/tabijijefepufunamexib.pdfIn PDF document text
    • https://aa4de0c4-a7fb-47f6-97fe-5721705e71c1.filesusr.com/ugd/824332_405eb486b4db4046b2150b5c9ac88ec4.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_14eac07954ba4635903c0ac4ea18b138.pdf?index=trueIn PDF document text
    • http://bowegasobufur.myartsonline.com/dakufuxabuzuwozufofugof.pdfIn PDF document text
    • http://betiger.epizy.com/checkpoint_4600_datasheet.pdfIn PDF document text
    • http://soxalisaxofaba.epizy.com/19047156164.pdfIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_3e488004da484a438bfa8c584e97feb4.pdf?index=trueIn PDF document text
    • http://texokobatogu.epizy.com/uc_browser_java_app_phoneky.pdfIn PDF document text
    • http://kosener.epizy.com/ajax_javascript_file.pdfIn PDF document text
    • http://xikulajofag.epizy.com/83636547413.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_101f03af6b1a4a5083ca95b30246d893.pdf?index=trueIn 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_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 5544 bytes
SHA-256: c498aa329fc41509b79f56262b863f4990418c6d0d7d856a871d93ce89c5e195
font_01_sfnt_off000109be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BE 11168 bytes
SHA-256: edbe9149962fbff75eb8b49f1ba6c84a2ced1f11aa766837b0ba510355ddf246

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