Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad86125d6d74461a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 20:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c9c8a91ff5645338b46858e65031213 SHA-1: 2e09c0f68f5fd30e2d7848ee10b3c0d262a1806f SHA-256: ad86125d6d74461a2e3291c53cbb2a544cadb9e046fff03824e9be3c11c4a280
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to direct users to malicious websites. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure and numerous external links point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/123?utm_term=hr+management+system+pdf
    • http://fefiwizam.sportsontheweb.net/39821761213.pdf
    • http://vevaxogejaz.scienceontheweb.net/kitchenaid_professional_600_mixer_troubleshooting.pdf
    • http://mufutekuson.getenjoyment.net/42655505173.pdf
    • http://fidekeleko.medianewsonline.com/bebovezurepegigeximuveg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf351892-a4ec-40ba-bc76-248183eb223c/95726159188.pdf
    • https://s3.amazonaws.com/jamuluvuvava/mera_bhola_bhandari_song_new.pdf
    • https://uploads.strikinglycdn.com/files/c05d5b10-04da-4c05-a33e-16739acd4b26/ritenetuveboget.pdf
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_c27cacbb4a8045dcac4b6def264644c6.pdf?index=true
    • https://s3.amazonaws.com/vidadaviwal/what_fuel_is_recommended_for_a_5.7_hemi.pdf
    • https://uploads.strikinglycdn.com/files/954d8490-641a-4546-a115-e212da70b668/financial_management_theory__practice_15th_edition.pdf
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_9f56e389befa4b5998c0fe92304cac83.pdf?index=true
    • https://uploads.strikinglycdn.com/files/93a21aa1-dcd0-496f-af58-2bbc6d4a7809/finexewimipa.pdf
    • https://uploads.strikinglycdn.com/files/d491826f-d2f7-4ac7-88da-9bb2456602d3/do_subarus_have_bad_transmissions.pdf
    • https://s3.amazonaws.com/fifuto/waring_pro_waffle_maker_recipe_book.pdf
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_c011550c1d974039862cc5552fecdd27.pdf?index=true
    • https://s3.amazonaws.com/gekixadonuru/60653462218.pdf
    • https://uploads.strikinglycdn.com/files/e87dcd7a-700f-4222-b7fa-3e85d8e42a05/lowrey_small_organ.pdf
    • https://uploads.strikinglycdn.com/files/557f46a4-d257-4f4f-aee6-2c1330f76dad/docker_command_install_windows.pdf
    • https://uploads.strikinglycdn.com/files/099b091b-add9-45f4-8953-51fa493507ee/nokerir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a4.bin
e369a5d73a1db85f583af87bddecb93b44b8592a4faa8be03129d1864039fd60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 5392 bytes
font_01_sfnt_off0000faef.bin
a4509a375af8852a50879a2e71267614f7d6c873d74bb94b4bb8c78820636b7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10280 bytes

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