Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3d8bd312c45c98…

MALICIOUS

PDF

77.3 KB Created: 2021-01-19 18:47:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9b0f3f5445f628bcd9f1bb6c4efc6595 SHA-1: b3f96732e51b2f59fcb08a49f5cf4608213516c9 SHA-256: 3c3d8bd312c45c98daece239d07f141c86f232fb3353292a3930dce0c89ce656
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure and a high ML score. The document contains a large number of embedded URLs, forming a link farm hosted on disposable domains, which is a common tactic for phishing or distributing malware. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gettraff.ru/123?utm_term=wood+project+planner+free In PDF document text
    • https://cdn.sqhk.co/rilowikapaz/jdjbFii/final_fantasy_dimensions_2_apk_free_download.pdfIn PDF document text
    • https://jekaboda.weebly.com/uploads/1/3/5/3/135398795/5595676.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/ehi6HJK/73990798962.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/iFyPijh/73036283707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368471/normal_5fa3551b7ccce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499282/normal_600177de17428.pdfIn PDF document text
    • https://pisubemiduburor.weebly.com/uploads/1/3/1/3/131380627/zarixidele_lexerov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5fda5c980693d.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/Djiihji/16008877328.pdfIn PDF document text
    • https://firaxefa.weebly.com/uploads/1/3/4/6/134694685/lafovegima-dupakubelili-sajejovaluf-goronarenala.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/1b30e0fd.pdfIn PDF document text
    • https://cdn.sqhk.co/mapigusene/b7ia8jd/voice_jump_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402481/normal_5ff1270eb6873.pdfIn PDF document text
    • https://cdn.sqhk.co/molewekane/7Lwhcje/dynamixel_sdk_example.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412902/normal_5fd8b4af4e36d.pdfIn PDF document text
    • http://juwolopuga.66ghz.com/nasamojevotimulevep.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/fJOWjtG/langrisser_i_ii_ps4_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumilamufitilu.epizy.com/10745039661.pdfIn PDF document text
    • http://xefivaz.epizy.com/56238572406.pdfIn PDF document text
    • http://mojilobopage.rf.gd/past_simple_regular_verbs_questions.pdfIn PDF document text
    • http://zebofazedixa.rf.gd/canonical_sop_form.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_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 5060 bytes
SHA-256: 9fd9dca76e93bee91f2cef31e3506d0f1186e037f8c7f59ce34e780540e92a24
font_01_sfnt_off000104ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104ED 10176 bytes
SHA-256: 12f8cb8ed2b7218769756a9e5d24073faaa5f1d584c3fff978d27facb02804b7