Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a97e817edf75bf…

MALICIOUS

PDF

79.6 KB Created: 2021-03-28 10:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8da1072f5e206aa70a9ed2ed7a2cd344 SHA-1: 160c27a08e5ec5cfeae2281efe83a04ec75d8926 SHA-256: f7a97e817edf75bf623afa65b6d7c0bd97c51b4bf70c4ad3400ca7fd7ae38d06
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used in phishing or to distribute malware. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links, many hosted on disposable domains. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95'. The document body, though heavily corrupted, suggests a lure related to a 'Toyota avensis verso service manual pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://seumenha.ru/award?keyword=toyota+avensis+verso+service+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446914/normal_602cffbea20d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_602c03dec825b.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/jurnal_bartolinitis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500444/normal_60561e0556181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482638/normal_603c41704d334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388814/normal_5ffa867b28339.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/tablaturas_de_canciones_para_guitarra_electrica.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393485/normal_5fe23eb1ee62c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_6022643c9f64a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486061/normal_5fe0b3ebc1bdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_5fd82d1337f1f.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/3b21bcdc-0909-4f49-8701-e29c7c725be3/bomidirutu.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_80c71e457080405baa2b64485d6a2f76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/162eefbd-8188-4503-bbe7-fd37b597e2ac/excalibur_food_dehydrator_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/96966625322.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_a4b9bbf22e364437be3acace006b2d69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/georgia_driver_s_permit_test_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721e6994-a2ea-42d1-9b93-80c1113b0be5/the_danger_of_a_single_story_chimamanda_ngozi_adichie_main_idea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e19cab66-0edc-4627-b37d-3e6553025504/gugelonuxabog.pdfIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_58bcd2eab2da43e99ad3382222896c9b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/806414db-8ece-4923-8466-76a593ca9a93/how_to_remove_a_volvo_penta_outdrive.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/create_animation_file_in_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/music_maker_jam_for_pc_free.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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 5412 bytes
SHA-256: a5a1d33165bd93118c6532952733c3d1a433c4b1aff5e798631f4a48c8fe579b
font_01_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 11224 bytes
SHA-256: c5520879d5f65ac10ea1a840cb6e0a89346b16b6e952503cb53e4d3d49643dfa

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