Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5d696745d10474…

MALICIOUS

PDF

72.2 KB Created: 2021-02-11 21:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6d90bd0dfb3d1ab72d0e958c8b33ef1e SHA-1: 892755ed4e2c16a82219a5616d54e247e131806e SHA-256: ec5d696745d10474e88b4c2790731cb83cc3ff2b009f5cbff0b8dc296eacd43e
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to redirectors designed to obscure the final destination. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a pattern of creating link farms for SEO purposes, often used in phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/123?utm_term=members+mark+grill+service+manual PDF link annotation
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/mikekogepewe.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/361371.pdfIn PDF document text
    • http://duxojiz.iblogger.org/lagu_beggin_madcon_remix.pdfIn PDF document text
    • http://kungfumalibu.com/augusta_national_weather_reportsq258.pdfIn PDF document text
    • http://surogufepisim.iblogger.org/guided_anti_ship_missile_crossword.pdfIn PDF document text
    • http://leafester.online/audition_fools_who_dream_sheet_musickajo8.pdfIn PDF document text
    • https://kupepepa.weebly.com/uploads/1/3/0/8/130874668/9275525.pdfIn PDF document text
    • https://givodevivunafa.weebly.com/uploads/1/3/1/8/131871579/liwewifoxux.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/ropuba/13336922931.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/niwanazoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/cayman_immigration_work_permit_form.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/ashrae_90._1_user_manual_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/vuwanebamesimezemukuxoli.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/werewolf_game_app.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/28986182136.pdfIn PDF document text
    • http://gifimedirawi.epizy.com/aptitude_test_book_free.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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 5388 bytes
SHA-256: 0852727a4b54a608836df941eba5f87ad2e458456ca58e33c5b389781976e2e7
font_01_sfnt_off0000ef3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3F 10628 bytes
SHA-256: a17c9b1a19d9aa4ec159b0437fa62719d39b58c85431f2e82e0856a0cdeaaaef

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