Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8f0a72f0c2ae6c…

MALICIOUS

PDF

77.1 KB Created: 2021-03-10 06:26:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f0964ba4b458c9dbab3287b61ba45d5 SHA-1: b9b3ab901cb94dd9ddec34009d1899dd820dfb8a SHA-256: 2a8f0a72f0c2ae6c8b28979babcd79fcba8a862a1893f5eae540a1ba261af58b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external links. One of these links, 'https://jumiwimov.ru/award?keyword=topology+optimization+altair+pdf', is directly associated with the document's apparent theme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/award?keyword=topology+optimization+altair+pdf
    • http://fit-italy.space/978430005592o0ec.pdf
    • http://wei-nmvc.com/feresimapamalufonbbwkv.pdf
    • http://sportplays.ru/sivupunedixovaveguvadn91ca.pdf
    • http://kernig.store/2008_gsxr_600_service_manualw41zc.pdf
    • http://oyuncuxx.com/the_magus_explained6noux.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/07a04489-ab10-4c3a-810e-b2d21b22950a/why_is_my_vizio_light_blinking.pdf
    • https://uploads.strikinglycdn.com/files/bca2a38b-0519-4fc7-ae43-a42f0d634a31/how_to_pair_altec_lansing_speaker_to_iphone.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_3acf30856945407081afd07cdf809c5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7d6ea4e8-5a02-41dc-8323-64229442a4c7/pals_plus_assessment.pdf
    • https://s3.amazonaws.com/radubozufiwo/how_to_connect_to_time_capsule_via_ethernet.pdf
    • https://uploads.strikinglycdn.com/files/89e363fa-6018-49d6-950e-c4dd5c5205f1/zutugapizisevomativazewez.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_c14bef5e5039448aa27d7d826622c370.pdf?index=true
    • https://ac65beef-1c88-4b01-a948-251493ed82f2.filesusr.com/ugd/09857b_93ab07e681ac482aa19207bf70fce419.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_841d4be3566946e0a8d68ae2c1ec4865.pdf?index=true
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_af5485d105f94f12ae26a78ca4c70d56.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c12af58c-1ee7-430a-a5e1-f3194b705268/common_core_ela_language_standards_grade_4.pdf
    • https://uploads.strikinglycdn.com/files/cead3424-ff35-4646-8f45-18aaf36f02ab/20310976831.pdf
    • https://s3.amazonaws.com/gixirojozogufux/dunkin_donuts_sausage_egg_and_cheese_wrap_carbs.pdf
    • https://uploads.strikinglycdn.com/files/fb89a06b-67ba-442b-bac3-63074eca8e24/lawowunenujuperabelini.pdf
    • https://94db4134-5784-44c5-a63d-963e509970fa.filesusr.com/ugd/9c58c5_1fdb521768fb494bb12b066e5df313cf.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f4.bin
9ee959e1f376f44640ecc1e81e74fcfcd30b40bde146c34dd8628163ec5c2670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5284 bytes
font_01_sfnt_off000102e9.bin
e9fc1db1a8d731c54bf48016050b0acdaacb75caefd81aa1512b9f90020ae553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102E9 10656 bytes

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