Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed6c717771f6666…

MALICIOUS

PDF

72.8 KB Created: 2021-06-10 17:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 6352b5058cffe52136a6abacd21eeeca SHA-1: 315c4365f9dddfc69b347d424aa3bbadfca77c5c SHA-256: 0ed6c717771f6666b437825bb6665b7d8cf22f17585172dae2d403035fdb2096
186 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary malicious URL identified is https://infrive.ru/pbw?utm_term=wedding+crashers+movie+download+480p, which is likely used to distribute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://infrive.ru/pbw?utm_term=wedding+crashers+movie+download+480p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370560/normal_5fe848cfaacdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_601447357c4f5.pdfIn PDF document text
    • https://zokagagewawo.weebly.com/uploads/1/3/4/3/134346606/repazelo-lupop-duwuxiliw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_603297580a6bc.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/wodirizip.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/48259172-9d0e-4b21-854a-d5395a91ffd5/bible_commentary_matthew_henry.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/144777591/fotijop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1c42d2e-d4dc-4623-b1f7-d306dae78295/54232024820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d313262a-ea66-44a8-9d44-dc5f3d0b0f1a/iskcon_bhagavad_gita_gujarati_free_download.pdfIn PDF document text
    • http://molitutolu.pbworks.com/w/file/fetch/144954051/26741275966.pdfIn PDF document text
    • http://mirusij.pbworks.com/f/bitisoniduwudekuzamabetek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c44e294a-7bf8-49f4-976f-386bebc5e409/sitoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7516192-cbf6-47d0-aaf0-7bdc27fcc0e4/how_to_start_forex_trading_without_investment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13723334-93c1-497c-9fee-ff00a00134c3/dufofusubejizubopag.pdfIn PDF document text
    • http://pafunanukexe.pbworks.com/w/file/fetch/144521907/price_of_lexan_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b800b104-87d6-42a6-9827-08a8e83a8edb/wajazimitaduferixofovoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c184bf-8a54-42b6-b8cd-5e76e7975f72/free_gems_clash_of_clans_2021_no_human_verification.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_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 6076 bytes
SHA-256: c6d99963594168ef78843f4ab669db783f737a6f8f73f519a477b4f159311d7d
font_01_sfnt_off0000f185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 10608 bytes
SHA-256: 8a6e65599e040fd86c245da3f4f72a46709dcdaaffac75c268e9e18724f8c108

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