Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec186a5c2a3a88b…

MALICIOUS

PDF

76.2 KB Created: 2021-05-13 15:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b2ed9c6615418a1e16d4c178664b8b5b SHA-1: c5e714638d4af4a1f8fafb91abef9d57578cace4 SHA-256: aec186a5c2a3a88bf5f570754f7ae23505f6e09d456abbcfe3deefd2d207d054
184 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or redirector campaign. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting an attempt to obscure the final malicious destination. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags links to known malicious redirector infrastructure.

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
  • 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 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://crophysi.ru/strik?utm_term=tell+me+three+things+book+summary In PDF document text
    • https://cdn.sqhk.co/ruxuvedije/Y2NxLeC/army_extreme_car_driving_game_download.pdfIn PDF document text
    • http://art-practice.org/63632061082g8o7s.pdfIn PDF document text
    • http://vepenuvix.mygamesonline.org/posiki.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/jgdtq7R/mezeligo.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ciggVNZ/nhl_prediction_app.pdfIn PDF document text
    • http://cleaner360.shop/begomce1tg.pdfIn PDF document text
    • http://insurancesouk.com/zuwakarisalupa6en7h.pdfIn PDF document text
    • http://olymptrade.buzz/5144561547l1hsl.pdfIn PDF document text
    • http://rusakadovub.sportsontheweb.net/dexesilojajatoxekowizigor.pdfIn PDF document text
    • http://daddytestit.xyz/satyanarayana_biochemistry_latest_edition_freefqzoa.pdfIn PDF document text
    • http://optarfes.com/gikakomga4h.pdfIn PDF document text
    • http://zzzmmmmejjj.space/us_army_tank_gunnery_manual4093h.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/solonebosop/noxibo.pdfIn PDF document text
    • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_7280216413d14525a611919d1180379a.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_88bf9ca492bd450a93217d2457b12af8.pdf?index=trueIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_bd7e4ef7ccec40589becb6c61acd7ac4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/hollywood_reporter_roundtable_actresses.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/wemanokajog.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_2db6e769f06d43dc99d67a355ec8fd77.pdf?index=trueIn PDF document text
    • http://sogivuwe.onlinewebshop.net/dafodanovuba.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5356 bytes
SHA-256: c8b0af2ebe97e8e3009eba673fc5512e2144e026becc6f4fe956fd1e5012e4e6
font_01_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 10796 bytes
SHA-256: 041925f2987da46c6b23b80e047fc78a7d9cf3c17cc0a67a2910fb929e380350

Open this report in the interactive analyzer, or submit your own file for analysis.