Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fc1d355884c033…

MALICIOUS

PDF

85.9 KB Created: 2021-05-03 23:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5aef50bc9676d1260a8ca25748ddf73a SHA-1: 70ac21b33f069d03abcf8125460fa291585fac60 SHA-256: f3fc1d355884c0332454fe9e4e61077f6b835e7b3896a13bbaddb2b81b17abe8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/strik?utm_term=hctz+davis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367007/normal_605b89217934c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459469/normal_5fd63f291df8f.pdfIn PDF document text
    • http://saniwigudovo.scienceontheweb.net/ligusotolate.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5fcdcffe79e77.pdfIn PDF document text
    • http://kavelizopepi.mywebcommunity.org/gobisajezaxenes.pdfIn PDF document text
    • http://degimogug.mypressonline.com/15183285376.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/1CghYEs/real_wrestling_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_606660fa2ab62.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/cjjijOz/movie_trivia_quiz_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/xonudutixova/bKhaGox/skyblock_maps_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/nakijalufiw/fhjdjiI/63380855931.pdfIn PDF document text
    • https://cdn.sqhk.co/riduwadanu/fP1gcic/android_10_for_note_9.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzikago/j1dtNxH/allama_iqbal_open_university_date_sheet_ba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465264/normal_5fe3a02baeeac.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/gGnTrhd/first_world_war_full_history.pdfIn PDF document text
    • https://cdn.sqhk.co/fawabanof/2wunia9/bihar_b._ed_application_form_2018_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/Q3xibgd/twisted_metal_ps3_controls.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/07ac0da3-1542-4b71-949f-3efc9374a6eb/gubageto.pdfIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/how_does_mcdonalds_use_promotional_mix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8bf8ba4-3bc5-4ac0-8ca1-a89e364fc2b3/fudemukego.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/fogogumurapeme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51be9006-ea1b-44aa-9bc2-f1dcd532d474/physics_for_scientists_and_engineers_10th_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343bb2b4-98fc-4d55-91c9-cbc26c99f9ba/weight_loss_workout_chart.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_off000114b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B6 5092 bytes
SHA-256: ba71055521efae7282f253cf95b155647155c1f5396888fcb425b7b9cdac40b5
font_01_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 10684 bytes
SHA-256: 74031591efe9d3a268c9a315db18a4373b64268e6cf8aa1c0c13e28b73fc33e7