Malicious PDF — malware analysis report

Static analysis result for SHA-256 e660bca765103094…

MALICIOUS

PDF

80.1 KB Created: 2021-03-29 19:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e05f111e405b8882eef0e92d0773f276 SHA-1: 490c3c05c240632d40198d079113bce65e7f80b6 SHA-256: e660bca765103094b77c81f8ca6cd79e91def307dc1f6629b4c8d71641e18675
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 embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this. No scripts were extracted, but the overall structure and heuristics indicate a phishing or malware distribution attempt.

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://midufefew.ru/wix?keyword=rockford+fosgate+r500x1d+vs+alpine+mrv-m500 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5fe1890bceff2.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/lydia_davis_break_it_down.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473053/normal_5fd7e4d0e6d97.pdfIn PDF document text
    • https://cdn.sqhk.co/botonerepap/j4ZvgFX/birthday_cake_party_pics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425908/normal_600c36584101a.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/gijjgeb/pvc_id_card_photoshop_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465015/normal_5fe86aec2ece4.pdfIn PDF document text
    • https://cdn.sqhk.co/nikofejujel/hhWgdjh/42344016208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392873/normal_60360ec72424b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448740/normal_5fe690da8d3ee.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/multiplying_fractions_worksheets_with_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5fdccd833d5bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_6044d98217cfe.pdfIn PDF document text
    • http://lumufurisazela.mywebcommunity.org/apology_letter_to_customer_for_mistake.pdfIn PDF document text
    • http://gixuloponij.mygamesonline.org/wegabifonove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_60161cd5c8ee1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawotopedexorod.epizy.com/mipodaxis.pdfIn PDF document text
    • http://dudijujixafag.rf.gd/reason_for_leaving_job_good_answer.pdfIn PDF document text
    • http://juwiwigepumer.rf.gd/formal_dress_uk_online.pdfIn PDF document text
    • http://wekaniloba.rf.gd/67421277197.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_off0000e7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E6 6024 bytes
SHA-256: 567844db804aa826793e9f5ca924c5683456727162a30ddd87375747fb4f8328
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 17156 bytes
SHA-256: 65605e8d9eb2314a7c13269cfc5f8bf7377be81cc3720fc7e96f5c0876346037

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