Malicious PDF — malware analysis report

Static analysis result for SHA-256 9685d27d26cbebb7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 09:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: dfdc11d8023bee1ec462a8b2ed2d103c SHA-1: 576eb026481425ff24337a42bcd1cd1ffda653ef SHA-256: 9685d27d26cbebb72a577e0354b6ba1dd9257d7bd9e41f26e0aebe14886c4e1d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm designed to host many links on disposable hosting, further supporting a malicious purpose.

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/wix?keyword=loan+application+format+in+word PDF link annotation
    • http://instapriz.online/hope_you_are_doing_well_formaltjhe1.pdfIn PDF document text
    • http://nebo-baikala.ru/how_to_improve_phonological_awareness3ocq6.pdfIn PDF document text
    • http://tersq.fun/75999308186v8zlh.pdfIn PDF document text
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/4934910.pdfIn PDF document text
    • https://woxarupuxanuma.weebly.com/uploads/1/3/1/3/131383908/f34916107.pdfIn PDF document text
    • http://natiral.space/gothic_calligraphy_worksheetsuu7i5.pdfIn PDF document text
    • http://bristol-yalta.run/how_to_charge_soundlogic_bluetooth_headphonesib2xu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fe1ca9c9764c.pdfIn PDF document text
    • http://straponartist.com/mitudinevolizaxvuh8m.pdfIn PDF document text
    • http://qwert-ita.fun/giripoxemukerik2eqae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_60330e0549104.pdfIn PDF document text
    • https://fiferogupinuwa.weebly.com/uploads/1/3/5/3/135306016/9367457.pdfIn PDF document text
    • http://vashastrahovka24.ru/gevojajijisu3tuev.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/68ab8b5e-46aa-4a24-8048-5fdcaaa11992/organic_molecules_review_worksheet_chapter_2_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d499bf6-aab8-49ac-9708-eb1e3e8837bc/good_healthy_food_to_lose_weight_fast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b120d39-7df3-4925-9e1b-2ba886954f6a/how_to_check_if_your_starbucks_card_has_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519b754b-4e67-4620-84ec-808a2d5fe34c/13186704074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20853011-3460-4674-bc39-4727c25752f5/linux_kernel_developer_jobs_in_india.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5156 bytes
SHA-256: 96fa0c75ee88597def0a1ca0195674a3be4fe14b5bbe459d31a3c90711456413
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 11308 bytes
SHA-256: a14f97a2733a8e0cf44ee42dfd032a2b783925acbc274330d581fd75d75d0056

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