Malicious PDF — malware analysis report

Static analysis result for SHA-256 d364797f4b4f2048…

MALICIOUS

PDF

93.4 KB Created: 2021-04-14 21:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f54a61c87edde54fdea4037d64795662 SHA-1: 4c680a4e31f7410297c99fc6c162ce8e30e3195b SHA-256: d364797f4b4f20487573ce6c5229f864d9de775bec73f01eb8f8e81ac123c0d3
156 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one prominent URL being https://seumenha.ru/strik?utm_term=how+special+you+are+quotes+for+her. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://seumenha.ru/strik?utm_term=how+special+you+are+quotes+for+her PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454821/normal_605fe0f7ad084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365635/normal_606992699e470.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413111/normal_5ffa8e41b7489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5ff718dc19ff0.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/fDhehd1/2476983741.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5ffaba0a0a67e.pdfIn PDF document text
    • https://cdn.sqhk.co/lilodipu/Ahghche/christian_songs_about_walking_by_faith.pdfIn PDF document text
    • https://cdn.sqhk.co/romemanir/jg3ijql/aws_cloudformation_deploy_cli_command.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_9e41ddfe4df24c4f9f82e45a748b2210.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mixanaz/bimaxepavanow.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/university_of_glasgow_library_and_information_science.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/minecraft_game_ps3.pdfIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_d1cca3c2961646deabea21e0a42bbba8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lumixi/absorption_refrigeration_cycle_performance.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_f0e6c8e6b18d40a39c24bcd44c4006e5.pdf?index=trueIn PDF document text
    • https://cae2aa39-5014-47ec-b549-0fed73f36d02.filesusr.com/ugd/c8683e_66c45f5aeba3419c930bf18a6d80752b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/blackpink_boombayah_ilkpop.pdfIn PDF document text
    • https://f856bbc4-01c8-45e4-8891-a53c5ee59fd0.filesusr.com/ugd/8e827e_41dc52dda817445ca332ca583b984127.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/manual_de_cade_simu.pdfIn PDF document text
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_0b69855911fc400f917ed13ac1670aa5.pdf?index=trueIn PDF document text
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_712dde513c9548689354a47123ae49c5.pdf?index=trueIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_ea4cd6b907fa4b1abe76961cb469c28c.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_6d42e007d15f419791993ddf8b347131.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/59151534068.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_off00012ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECE 5384 bytes
SHA-256: e1359082d694791f59200ba4a37e54b4c591a79fa941eae3e1918f3d284571a2
font_01_sfnt_off00014136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14136 10920 bytes
SHA-256: 9b13703055327750381e8a0a310814e6a01bcee69abd72d3356fc96435e7c1b7