Malicious PDF — malware analysis report

Static analysis result for SHA-256 1325ad498b6e5e85…

MALICIOUS

PDF

86.2 KB Created: 2021-03-22 18:11:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aed0ff1fe4a93dde98754a83e920b225 SHA-1: f5ce4907d6d2fae08e6b4edbd172b5024f8046b0 SHA-256: 1325ad498b6e5e85ff65934922ab1cdfd8077a62b59469675beb682c31644e19
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both a machine learning classifier and ClamAV. It contains a large number of external links, many of which are on disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of a URL with a 'utm_term' parameter indicates a potential phishing or scam attempt, likely disguised as content related to 'healthy 4 quart crock pot recipes'. No scripts were extracted, but the overall structure points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/strik?utm_term=healthy+4+quart+crock+pot+recipes PDF link annotation
    • https://cdn.sqhk.co/lisakopew/VxTZThf/commanders_palace_brunch_reservations.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484834/normal_6001bcbd4eb57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461483/normal_6018ddd9715c3.pdfIn PDF document text
    • https://cdn.sqhk.co/gokitoser/YL02HiR/7_wonders_duel_agora.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/jbqhg4y/xagatujezazofidobubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_6012396ea96ef.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/lijdFOW/ride_together_die_together_song.pdfIn PDF document text
    • https://cdn.sqhk.co/nawamuzimosu/5izhjgW/59433061373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fe4092a2cba8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_600a9ebfc156c.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/911dc38f-3cdf-418c-92df-b6619ed2aa8d/hp_monitor_no_input_signal_monitor_going_to_sleep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6f9490-5e95-4091-9c7f-887a6e265f93/the_night_before_christmas_song_gene_autry_rosemary_clooney.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_4b3f7acf4c8943a3992a83bca623a84b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07418ac-a091-4ff4-884f-e3a98456bb7d/ashrae_handbooks_for_sale.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_764ba26237474cc397e85f6bacff3ed1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/88948768676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdc2e9aa-2e94-4835-8c01-f73cd6859851/can_you_fly_without_a_real_id_drivers_license.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c9d869-4b21-43e5-9c1e-36b3de758a9e/english_book_grade_10_answer_key.pdfIn PDF document text
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_ad137c4e31634c01802c21387ed25836.pdf?index=trueIn PDF document text
    • https://55963656-6eb1-4b25-bcd5-bb835d65808b.filesusr.com/ugd/0064ae_f14f92437076473eb824b5971516bb20.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/126e7eb0-971d-4916-97a5-021af479deb8/what_is_the_difference_between_viral_and_bacterial_pneumonia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6ac9e9-79a1-42df-8357-81b8e92a6beb/17329219748.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/choices_stories_you_play_mod_apk.pdfIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_7cf87c5bc4794b0d8912bbc3bea82567.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/00ff7b32-c862-495c-9c86-edf0ae7cf0da/how_to_do_plank_exercise_correctly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5dc7771-f82a-4b05-8605-239b095b0980/40626473437.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_off000112ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FF 5360 bytes
SHA-256: 7a0bcb91ba414774d69478bb5500db5734911f8fede0f9af7b3813bee3b4c25b
font_01_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 10632 bytes
SHA-256: f7d19423ee409f6c5ad812fad95e632ccaf2822b84739ada4e6c7925b9d935ea

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