Malicious PDF — malware analysis report

Static analysis result for SHA-256 836759ac96df6b30…

MALICIOUS

PDF

85.7 KB Created: 2021-03-20 08:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 017675fd0eadeef616d188e0165b00f1 SHA-1: 952ef843b5b0acccaa6cc06d063bf7a03a128c4a SHA-256: 836759ac96df6b303812ccd5be0edd35e39ee9e70eebbe599701a5d404fbddbe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=hunter+pvp+guide+tbc
    • http://remont-kholodilnikov.website/54817949557791wl.pdf
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/0a945b53f571b1.pdf
    • http://prosale.company/45181053726ry0u9.pdf
    • https://cdn.sqhk.co/bemememu/gj10iif/40934153193.pdf
    • http://wegansit.space/art_master_summoners_war_firejpxs1.pdf
    • https://cdn.sqhk.co/kurotevu/idqIX3W/tom_and_jerry_movie_2021_twitter.pdf
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/nagezolu.pdf
    • https://xikemusuvef.weebly.com/uploads/1/3/4/3/134322181/vuzizenuxewu.pdf
    • http://vladport.ru/kofijobinaliremozejalako6m7f9.pdf
    • http://salet.store/72615647051kck6b.pdf
    • https://cdn.sqhk.co/xokipuxat/fhA3jcq/gikugujunidaderopep.pdf
    • https://pawizujepus.weebly.com/uploads/1/3/1/6/131637171/baxawupabepiku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_6887ec77f2f84e329602653bb953a08d.pdf?index=true
    • https://s3.amazonaws.com/zuxime/information_report_rubric_year_1.pdf
    • https://uploads.strikinglycdn.com/files/7ed8bc0d-2d39-4300-89d3-16b02ee07d40/6476530147.pdf
    • https://uploads.strikinglycdn.com/files/c1bcc983-78d1-48d1-b30e-72611bec76d6/1224639032.pdf
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_63c20ce17a1542a1b602b274e815262b.pdf?index=true
    • https://s3.amazonaws.com/legobegutulo/adm_apk_apkpure.pdf
    • https://s3.amazonaws.com/wizidimawag/lease_agreement_template_indiana.pdf
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_349d0c08b12c4522973b188f3f5b6ced.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f26f499e-5806-4bb8-b6e8-c6ffd152052a/wufenuwukaraxojetad.pdf
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_88ccc0b9431242a081746b8c83fc79be.pdf?index=true
    • https://uploads.strikinglycdn.com/files/67f8022a-9df8-4aca-a219-8bbc2f348833/how_much_does_a_full_detail_car_wash_cost.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_off0001113d.bin
38e3e4d992da967f777a37879bd28605001705a400ade9740a4f9c4a7987c563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 4980 bytes
font_01_sfnt_off00012245.bin
7c234ac6fd4660b8659bd60342db784c6f6b253bcc38579602ec9d9e2c1d6883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 11552 bytes

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