Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb66e43b497ca4c…

MALICIOUS

PDF

69.5 KB Created: 2021-01-14 23:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: a7541a7dca990ebfafba4a0ebd833248 SHA-1: 7e52267835e88cf89ccadfa98f7831891b147c9d SHA-256: bfb66e43b497ca4cd2b3100f0b54a6d7c280469e50d5e96734d917271219a64e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links, many of which point to external PDF files, forming a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at "traffking.ru". The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or trojanized document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=periodicity+review+worksheet+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f8a49ddc5202.pdfIn PDF document text
    • https://site-1176842.mozfiles.com/files/1176842/osu_information_technology.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/pibghc8/78580032044.pdfIn PDF document text
    • https://site-1193425.mozfiles.com/files/1193425/39066974151.pdfIn PDF document text
    • https://cdn.sqhk.co/kugeturo/djcTYig/motorbike_drag_racing_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_5fb5fed4b9ea3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466153/normal_5fadeaa31bd4a.pdfIn PDF document text
    • https://pabimoju.weebly.com/uploads/1/3/3/9/133997489/41860f113.pdfIn PDF document text
    • https://site-1228018.mozfiles.com/files/1228018/commandos_battle_pack_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/sezogitov/hc45hd6/hamilton_mixtape_rise_up_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jdFeLjf/dubedejuxabub.pdfIn PDF document text
    • https://site-1211821.mozfiles.com/files/1211821/49725613051.pdfIn PDF document text
    • https://site-1178723.mozfiles.com/files/1178723/goldlink_maniac_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/geraromu/jusivijifowafu.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_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 5316 bytes
SHA-256: f2f150845758f00ccc669158519a3938b2ab53e9b9567dbfd7b0b72560a301aa
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 10484 bytes
SHA-256: 5d95f5896d26b2d938e6d129bb796373b688670f1ed33fe1334fda9acd596463

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