Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af46fa184f57dcd…

MALICIOUS

PDF

82.1 KB Created: 2021-04-05 05:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0623494043bf6c280f491841fc314945 SHA-1: 9429c3a2d9752f9a5d9abbbc8819b1b968ab95b3 SHA-256: 0af46fa184f57dcd7f30709149b59a7ad3b6516a147745c0048da5ca11a0a4f9
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/award?keyword=pdf+split+and+merge+download+filehippo PDF link annotation
    • http://itgermany.net/lamborghini_aventador_svj_spyder_2020_cargurusrne9z.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/eidPGid/startup_ranking_framework_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388608/normal_600c5377e9eca.pdfIn PDF document text
    • http://medicinfo.online/mumisitaieb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475204/normal_604b418359257.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/djiekhS/hd_rainforest_wallpaper_for_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/jRWwrIl/first_day_of_spring_semester_2020_csun.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/cjhjfEc/gebilobusewatigitat.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/jRMHshj/pinumuwurowusonu.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/226585bc-4669-4b2a-bfee-9ce5f82915fe/nokenuze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/232f185b-ffff-4a7d-b3c5-13cc3a39d887/91442069736.pdfIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_dcdecf59a3ff4223a1dcbf67c537f9cf.pdf?index=trueIn PDF document text
    • https://eb22cd64-ba88-4d74-9269-d2b8937e52af.filesusr.com/ugd/3b217d_d709ecc1f8fb4bbab93ff59ae9d73854.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83c515f-af3a-4a0f-a0f5-1447793c222c/nosekova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b36ebbac-c86c-47b7-bcf7-157c61473539/power_of_positive_thinking_quotes_facebook.pdfIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_78edca33af62482695257de8631fe68e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfa9dd45-adee-4c2c-b76b-17159a3f8b6e/sigamovovaratiwowaxir.pdfIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_84a07a31bc4c47ac979b550fc6acd36d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8223e3c0-eedb-40af-8cc4-577a6df099a1/good_transition_words_to_start_a_body_paragraph.pdfIn PDF document text
    • https://73e25548-3913-4bbb-aa69-a1b25f69568d.filesusr.com/ugd/cece23_5e4e83330a5d45fd826813bf07caa81d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9ec106c-9507-4c34-86a3-a02ef27bc432/pabijobavudupolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b404498f-5ab8-4c33-989d-a84db021080f/braun_silk_epil_9_price_in_uae.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e183c146-e5a5-4a83-befc-1346b4715985/how_do_you_use_a_crystal_growing_kit.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_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 5548 bytes
SHA-256: 53161fbd55ecd287d3a6a147dc6594e58961b2018571332505b8b278680492ea
font_01_sfnt_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 10784 bytes
SHA-256: 4a283571d6345144664a42d47764617c7c120a165b1c83ccaf7b6c5152a4a0b5