Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdd0e306aab2af7…

MALICIOUS

PDF

83.6 KB Created: 2021-03-12 07:47:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 25f62f8ac83a3795f9177a73983a428d SHA-1: b86dcca083bc78867293b76971853e931e7833ae SHA-256: 5bdd0e306aab2af7552854fe24d9409d18c4a2b0a319b4456dc9264142ae724d
186 Risk Score

Malware Insights

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

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 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=vizio+sb3851-c0+firmware+update PDF link annotation
    • https://cdn.sqhk.co/pubusudes/jizctgc/best_mountain_bike_accessories_brands.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/jc3GigN/lubupes.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/RFfWf4p/411761228.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jIogdjj/zenigopaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/dojaxeje/5ngdPWs/8293623517.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/how_to_get_rid_of_best_friend_heart_on_snapchat.pdfIn PDF document text
    • https://cdn.sqhk.co/wazafanez/iehijba/42359015545.pdfIn PDF document text
    • https://cdn.sqhk.co/xufatirumina/1jdghF6/67940358132.pdfIn PDF document text
    • https://cdn.sqhk.co/vonezositixi/hASLgiu/kipageru.pdfIn PDF document text
    • http://sokixatov.mywebcommunity.org/47089081168.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/why_is_my_tv_screen_have_lines.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_27cec26452874272a409403be46b1f70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bejexe/whirlpool_washing_machine_7kg_manual.pdfIn PDF document text
    • https://527ed197-5826-4432-9c89-449afa9d705e.filesusr.com/ugd/65ef70_4292a545d11445b6915bd75c0b96507c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/gokegokopasedevatimegali.pdfIn PDF document text
    • https://e4586023-485a-43f1-9451-2d404684c5b7.filesusr.com/ugd/95ff22_823ecd6e27a448bfbea1bd224d65c8c4.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_19d874655cc44b5497ed9a7363f487b0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/numunenoji/74400869941.pdfIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_42ed49fef5ea4b768512957b9111efd4.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_39269bcc4a6c48b19957434fb82247c2.pdf?index=trueIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_56ddabd125144d38931c912dc6508a26.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/co___t_d___c__l__hangman_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/29428614033.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_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 6224 bytes
SHA-256: 2b6a64a10c526fc1f878fb4b9b3bb6124cb01420872ec6185bf6e41aaee10fe5
font_01_sfnt_off00011b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B77 11116 bytes
SHA-256: b33febb94b1a1acdd50b71189d466757230b09d2a42c4f271cb4aa78e4dd56ba

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