Malicious PDF — malware analysis report

Static analysis result for SHA-256 43402bf164335501…

MALICIOUS

PDF

73.5 KB Created: 2021-01-02 11:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 9f4836dfe5afea04695bf5304aaece9d SHA-1: 9873de8281fcc3e6194971d7e05c0ae65a931413 SHA-256: 43402bf164335501252d20c59392107487e26d008e2c91c81e99f661b9431d80
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a 'download' lure and the ML classifier's high confidence score suggest a malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=assassin+creed+identity+apk+real PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451221/normal_5fa4a3c433568.pdfIn PDF document text
    • https://jarapitoxedomel.weebly.com/uploads/1/3/1/4/131437170/rebekibomotomen-kosif-dusor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369927/normal_5fa1ba32cb45f.pdfIn PDF document text
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/pejofunerivakazupi.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/wibisijakaweban.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/fupewenawamido_zukexidemekuja_sonekixebeni_sekorej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_5fbf6b37b4e3c.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/504cd90c6.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/domijedaxixak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6dbc171d-b7ab-49df-bcff-0e4aecd3ef4e/remove_sound_from_video_final_cut_pro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534604dd-83f9-4beb-8e84-3183fa937f31/7564920665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6e659f-ea2c-4a8b-9ae6-6e617216e9a4/greene_county_il_court_records.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 4900 bytes
SHA-256: c78a9db29235eb4e1950fa4b0eeac0b039068e1afc6396f6952df217faa7bbda
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 10996 bytes
SHA-256: 61a887db01e265dba96202d17f554afa6f403142ef09747fc9340f5872024dcc
font_02_sfnt_off00010b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B30 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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