Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8f624cea650c2f…

MALICIOUS

PDF

74.8 KB Created: 2021-05-12 17:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d8dfe3c72ed610e1c93884ebb5961ec9 SHA-1: 91c92cff8d57636369dc03d89871b613d841c505 SHA-256: de8f624cea650c2fdd1688dc26b87a31e947cd8633afc51cbf540ea7c3a4404e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and exhibiting link farm characteristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://botokaw.ru/strik?utm_term=why+is+my+outdoor+antenna+not+working PDF link annotation
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/xozejabis-sofiro.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/hdIfijO/theblaze_tv_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448727/normal_606781e45748f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450889/normal_600d08956c6f5.pdfIn PDF document text
    • http://byt-upak.ru/cbs_the_stand_review_rotten_tomatoesu8zwv.pdfIn PDF document text
    • https://cdn.sqhk.co/xunijejozi/jejdih0/6352074589.pdfIn PDF document text
    • https://mepubigavij.weebly.com/uploads/1/3/4/5/134599646/be74b86bc577be5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_5fdba672e241c.pdfIn PDF document text
    • http://wexypay.icu/cooking_mama_2_recipesgw82k.pdfIn PDF document text
    • https://moninedowilex.weebly.com/uploads/1/3/1/4/131436981/80c1a0cdd7.pdfIn PDF document text
    • https://sagetiruguw.weebly.com/uploads/1/3/0/8/130814856/4c590e60b7290.pdfIn PDF document text
    • http://yellownatural.space/genopi4y35r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489257/normal_600b688e20384.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/9275932.pdfIn PDF document text
    • http://wildber.store/definicion_de_productividad_segun_autores172vg.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/EWgjrwq/19428401452.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirorip/hjs9hiX/billie_eilish_lyrics_no_time_to_die.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/19851854-33b3-41ab-9a44-64cd8f13bd5b/james_stewart_calculus_8th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd0b5cc3-e041-465d-9722-e8439d5d3762/how_to_refill_an_hp_61_ink_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cd78ccb-28c3-4125-9635-c0bed02f89d8/how_to_heal_your_body_mind_and_soul.pdfIn PDF document text
    • https://7ec9ed57-df89-401a-953b-45744c150cee.filesusr.com/ugd/6e3131_e7758d242a4c419f80dc210f186feebb.pdf?index=trueIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_2273fcb7069a49b399da5e50d613de02.pdf?index=trueIn PDF document text
    • https://9a4203bb-6ff2-4ef1-9c63-3f113f84a884.filesusr.com/ugd/ea9bdf_9c7b14886c6c41b68bf648eb360728e1.pdf?index=trueIn 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 5480 bytes
SHA-256: fbd80ea63b97b0550b30c978e1309c7763431cc29f0ff2291eddd276c58eb198
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 10444 bytes
SHA-256: 645d4dfc299d1e0d7eeed976f302c00d888e095ff8885c0443e0f15bf9a935fc