Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd0d353e27727d32…

MALICIOUS

PDF

74.3 KB Created: 2021-06-14 15:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a7aa87462b3585fa88153bb86af00c7e SHA-1: 55d6b35360e1534b8b43fe439829dfcda1856ccf SHA-256: cd0d353e27727d328c9a320bedd23b25caf196af91d8a60fc89be6dad620e05a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, including one to 'dugedepap.ru', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of external links and the overall heuristic profile indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/123?utm_term=lg+innotek+drt+3.+0+42+datasheet PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4393029/normal_60b24deac1159.pdfIn PDF document text
    • https://bojirutewum.weebly.com/uploads/1/3/4/6/134622564/mipuwere-rogazadowipirup.pdfIn PDF document text
    • https://waweviruwupo.weebly.com/uploads/1/3/5/3/135311422/gukululafemulokomuf.pdfIn PDF document text
    • https://xaminipa.weebly.com/uploads/1/3/1/0/131071220/3b9683cce5a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_601e640a1d1b7.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/duluk.pdfIn PDF document text
    • https://zufezegudowoz.weebly.com/uploads/1/3/2/6/132683286/472076.pdfIn PDF document text
    • https://rivixemip.weebly.com/uploads/1/3/4/6/134609840/wogusemeralexesem.pdfIn PDF document text
    • https://bexukisutiso.weebly.com/uploads/1/3/0/8/130873741/f4d9df36b9.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/ececc45a-fb1c-4917-91a7-9319333f7a42/13792211045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4424a57d-be5d-49f6-aace-6017018b4826/physiology_linda_costanzo_6th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60a38a1e-2884-44d6-b27a-f3ed315d65c2/war_of_the_worlds_full_movie_free_online_watch.pdfIn PDF document text
    • http://vezawegafu.pbworks.com/w/file/fetch/144875223/naruto_online_mobile_apk_download__50____Low__0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4adbdea-635b-4e72-a984-33cfed5c8435/how_to_remove_ice_maker_from_samsung_rf263beaesr.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/kidenagowevikivefewu.pdfIn PDF document text
    • http://fufitan.pbworks.com/w/file/fetch/144634587/streaming_fast_and_furious_7_subtitle_indonesia.pdfIn PDF document text
    • http://lesuraxuxu.pbworks.com/w/file/fetch/145072722/informal_email_to_a_friend_example.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 5620 bytes
SHA-256: 1419641c99562469761623fd967c2d7910d37ef52ec7d2b984b33ec900abec5f
font_01_sfnt_off0000f65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65C 11840 bytes
SHA-256: 7baab1c1f2f55d1f566a964ca54a857f03c9bdecfd0b15473d9fce11a9f6a1e1