Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba281252ffdb8e7…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 00:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b4cd4becde4f533ef039bc36064bc148 SHA-1: 5837de203fb342e1ed14ae93d267b76e69ef066b SHA-256: 5ba281252ffdb8e7d4a4a9280a53a85b8320bb6472fd7b04b93221f7222a0ce8
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://dafemum.ru/strik?utm_term=how+to+reset+dvr+to+factory+default+without+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367268/normal_6047f1b31dad9.pdfIn PDF document text
    • https://cdn.sqhk.co/wedifedaguju/ia9iigg/skyrim_find_red_eagle_s_sword_location.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ffc12c3b9505.pdfIn PDF document text
    • https://cdn.sqhk.co/gukituzaju/ghsFe30/download_strikers_1945_classic_mod_apk.pdfIn PDF document text
    • http://tabikola.online/vigipixuvilofudavugivejybd0s.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • http://yoptan.space/labupijojepanetaganurb0dnn.pdfIn PDF document text
    • http://particuliers-societegenerale.xyz/theses_on_the_philosophy_of_history_benjaminhhvcn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392666/normal_5ffa4d3a3924a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fec453be82b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_602205d787d79.pdfIn PDF document text
    • http://keksik24.ru/fuvimobupubugerd7chw.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/8df4d454-938f-48cb-9be4-dce7bf9deef2/reviwexafaweganikal.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/28491969026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/beda95e2-8311-44b9-8d8f-28ff7106d93b/3319324919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6187db-3fb0-4a4c-bedc-5bd6b4d57bca/xifexasoxipixasumo.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/mibovud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95ad7327-2107-4790-a6d9-5f9826d889b2/power_miter_box_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/40317795070.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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5476 bytes
SHA-256: 23f5167c332ed91d58241042a29194663d2f929223edd5811b716b2ad1070d5e
font_01_sfnt_off000100d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D8 10520 bytes
SHA-256: 153db0fd41281cc1f4ffa9279951b9b8ad50a9675fdae90de1cea083a786ebd1

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