Malicious PDF — malware analysis report

Static analysis result for SHA-256 838f582b2c63e6be…

MALICIOUS

PDF

71.0 KB Created: 2020-11-17 12:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: bf8a91d07d0efbab01b00481efdb97bb SHA-1: 6304a2b41c11bf710b93fe8a69492640c50641c4 SHA-256: 838f582b2c63e6be890d42beaf02561e6fbbf89149b0d26e4f17e260cf40e42c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://gettraff.ru/123?utm_term=violet+beauregarde+blueberry+2005 In PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/sewudarat-nabinuv.pdfIn PDF document text
    • https://jurizimobijagi.weebly.com/uploads/1/3/0/8/130874317/cf87370e8e.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/lixuzo/scp_682_death.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef75ea82-439b-471a-88b6-5404285c974b/defoliation_game_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd3969b3-1497-4cc1-b1c0-58a6799bba7d/menobobonatanotasevewigax.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/best_video_er_facebook_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766fbcba-008d-43c7-9e12-69bdc5b71af0/jabamene.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/sparkly_animated_food_gifs.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/charter_school_application_nj_newark.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/roblox_codes_redeem_link.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/11779422030.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/vozizerelemedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83aff8a-a3ff-4ad4-a67b-9ad3a6a66221/tefalifosamorike.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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 5420 bytes
SHA-256: 77fac1b755879368549feae6097c43402225cf30387eecf4ff1c8088976c7bdb
font_01_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 9716 bytes
SHA-256: e8b8b794fdd090353ec6b9a104036eed92db382d9696da0bb28196dd967c5105

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