Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e403b7dc38491e…

MALICIOUS

PDF

113.2 KB Created: 2021-04-04 06:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1f485be874e6f0bc324fba1767089a81 SHA-1: c14ce55182383bedc83e6fd63afc3686c9524ab5 SHA-256: a4e403b7dc38491e7b21b4f1df55f07b1c273f5b80256d2a7fc9cbaec7565915
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9997

Heuristics 5

  • 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 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://xezojetit.ru/123?utm_term=schedule+d+instructions+2018+form+1040 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476273/normal_6025f2224fc17.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/V3xifA2/crossfire_trail_quotes.pdfIn PDF document text
    • http://digitalmicroteter.xyz/22986353990pfo1s.pdfIn PDF document text
    • http://ritixabig.iblogger.org/9408941883.pdfIn PDF document text
    • https://cdn.sqhk.co/sepexapubu/gjhdibw/bavilo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488346/normal_6010c77248ce3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5ff0eef1ce72a.pdfIn PDF document text
    • https://cdn.sqhk.co/wavivatus/e2vihje/dungeon_defenders_awakened_release_date_xbox.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/jigbijh/31069241135.pdfIn PDF document text
    • http://portkamesto.site/followers_for_twitter4mspt.pdfIn PDF document text
    • http://titoto.xyz/kevoxupesajamelovop2gnvo.pdfIn PDF document text
    • http://fruitslope.online/nuvobikefuberiteseragesfap5r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ketufazez.rf.gd/creature_full_movie_3gp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efdea5f-c4a2-41ef-874e-f6aa2ae82fc5/boy_scouts_of_america_logo_vector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f46b78-dff0-4a2c-8f77-be7ea6d8b285/paregefupegatatugujajotu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03da57fc-b8ad-4ce2-aeca-2f2dfc9afbc0/57749450767.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1369dc15-e300-465e-b8ef-095edb08908f/roxokijolerurepuvitet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c79d70a-8841-444c-86fe-dbb1e102fbdc/what_can_i_mix_with_crown_royal_black.pdfIn PDF document text
    • https://30dce114-5b7d-4ba4-aa44-e083516804ec.filesusr.com/ugd/7de0fd_a9bac58e97434f95b5dbc4ba835c351e.pdf?index=trueIn PDF document text
    • https://fb413987-6e77-4bf1-aaa6-e97eb550fbee.filesusr.com/ugd/108936_109dbc3659c2480e8f213a5ce1334f5c.pdf?index=trueIn PDF document text
    • http://jojukam.epizy.com/busifubo.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_off00017d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D5A 5760 bytes
SHA-256: 5b10d50f97f2d6ebf5e256f2233ef3584d7d5c09e221b06a6c53cb4cc32716e6
font_01_sfnt_off000190db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190DB 11436 bytes
SHA-256: 96c522d2ddf41f42d82b8cd346c18d398333da3a53e249015eec28e6f88ddb0e

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