Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3dbea58c2338c8…

MALICIOUS

PDF

73.6 KB Created: 2021-04-03 03:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ffacc1ca98471aef52a654d9c0fa3b7d SHA-1: d3b232053467371c7dea52dbc9b48ec4d700b36d SHA-256: ae3dbea58c2338c881ef2da66fbe0b7b1b0c221eb6baed2b45f4a75480a4ad44
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection for Pdf.Phishing.Trojan. The embedded URL points to a domain associated with malicious activity, likely serving as a lure for phishing or malware download. Although no scripts were explicitly extracted, the PDF structure and URL suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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 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://jacksth.ru/strik?utm_term=how+to+negotiate+doctor+salary PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462694/normal_6000be4d31006.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/VhagfuW/vixella_cc_tumblr_maxis_match_eyes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366976/normal_602aef65b2baf.pdfIn PDF document text
    • http://vavimaj.iblogger.org/21275896964.pdfIn PDF document text
    • https://cdn.sqhk.co/sixajuzap/jheZseU/zombie_survival_games_pc_low_spec.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/a0jajRQ/tiktok_disney_filter_cat.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/cfhgWjv/crossroads_mall_bellevue_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/kgihbie/evertale_new_ssr_characters.pdfIn PDF document text
    • http://biworigi.22web.org/linujozevixomuviw.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/900350de-023f-4f2f-8119-579ef475c27f/emerson_quiet_kool_air_conditioner.pdfIn PDF document text
    • http://datonojafasaxup.rf.gd/girimitiwemire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffc82596-ce78-4c9f-b5a0-fc07a09e7b69/glenn_vilppu_drawing_manual_free.pdfIn PDF document text
    • http://nanaxaj.rf.gd/voneleseno.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_7ad6f6fb6f544767b477b134f73dfea3.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_b27d7fd57a7c4f2a90ac2fb991a8414d.pdf?index=trueIn PDF document text
    • http://dagimasara.epizy.com/rewrite_the_stars_piano_sheet_music_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201b2669-79e3-4f90-86c6-c89f1cd6c5a1/sojinewajuvijapasavowel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d645d48d-20a3-484b-a486-f2940a12fe48/97189863465.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_off0000e388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE388 5260 bytes
SHA-256: 3e0c466b9538e1ba629200084d5936c11f10a351429d402457e74022c7449405
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 10408 bytes
SHA-256: ad5445ca2a102d6e14cc8c170f5655a7622f5db46baada25d355b07fb1e09af1

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