Malicious PDF — malware analysis report

Static analysis result for SHA-256 84cf051db3f08d01…

MALICIOUS

PDF

79.0 KB Created: 2021-03-14 23:15:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8a47694fd6bf20fbb2bfe8a3289707d SHA-1: 9890423c7aedca588995817831bdcb1f2aabdee1 SHA-256: 84cf051db3f08d014275b99420ebb8118f7061fbe6308457b87aa1700e0552c7
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one specifically pointing to 'zajinet.ru' which is flagged as a potential phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable hosting further supports a link farm or phishing lure strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/strik?utm_term=principles+and+applications+of+electrical+engineering+rizzoni+6th+edition
    • https://static.s123-cdn-static.com/uploads/4426972/normal_5fefd429777d4.pdf
    • https://cdn-cms.f-static.net/uploads/4443578/normal_603c4ea14ade4.pdf
    • https://cdn-cms.f-static.net/uploads/4387419/normal_6023bd85d14d6.pdf
    • http://meetplafond.xyz/redolitonifaxeaf3fc.pdf
    • http://zabovawupe.mypressonline.com/league_of_legends_patch_10.24b.pdf
    • http://nuloriwilorij.scienceontheweb.net/52977661851.pdf
    • http://shoop-fo.ru/xapirezuwufepovaled713fu.pdf
    • http://duwuzoruperiged.scienceontheweb.net/math_formula_class_9.pdf
    • https://static.s123-cdn-static.com/uploads/4402711/normal_5fc8ea81b265f.pdf
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fe69a8fad338.pdf
    • http://ig-verifiedsbadge.com/sudoku_solver_python4i9sb.pdf
    • http://jepenufi.getenjoyment.net/2009_ap_english_language_and_composition_free_response_questions_sample_essays.pdf
    • http://wogivodugakovek.mygamesonline.org/reguzufirugodiwokadot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasomusogapovi/xuruvovusarebiji.pdf
    • https://uploads.strikinglycdn.com/files/19dd9ca1-b94e-4f0e-8ee9-49f540828312/60787113425.pdf
    • https://uploads.strikinglycdn.com/files/91b13b30-cf73-40df-a142-d18a67a1b875/all_my_sons_movie_trailer.pdf
    • http://kafotafuvodalix.onlinewebshop.net/is_flavoured_soy_milk_good_for_your_skin.pdf
    • http://zeroxezubanalil.onlinewebshop.net/reliabilt_pocket_door_frame_installation_instructions.pdf
    • https://s3.amazonaws.com/baposivarabuj/fejosobarobibofinu.pdf
    • https://uploads.strikinglycdn.com/files/b698c5b9-14b5-4e3a-ad2e-3c54e1154ab5/wozuketesife.pdf
    • https://uploads.strikinglycdn.com/files/d7b38078-8cab-46be-8903-30c6cd10e1bb/66875018157.pdf
    • 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_off0000f553.bin
c1c8acffbdb15fbec94e4759c3df6f0085c58332bf4008ec9ea30a3a565ff46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 5624 bytes
font_01_sfnt_off00010876.bin
943d44011aa29cffe997f9e109f02759155dadb3dddf2598074db9eb16a1a5b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 11104 bytes

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