Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3295a2282c1023…

MALICIOUS

PDF

79.3 KB Created: 2021-05-03 23:41:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0582e1c4ffd3a9b01f926cfb7abd6ee0 SHA-1: 997e52aebca41680435a4d51427532d742cff368 SHA-256: 2b3295a2282c1023d1d1a593a40c1d73a079aabe0084a963f1aa67cd687c4d30
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though partially corrupted, contains metadata related to 'wkhtmltopdf' and a title about critical thinking, which may serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+are+the+8+steps+of+critical+thinking
    • https://cdn.sqhk.co/remimidotomi/hiGidxd/vikings_game_live_stream_youtube.pdf
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/8414804.pdf
    • http://zofugef.mypressonline.com/ap_sachivalayam_jobs_2020_notification.pdf
    • https://mefanajumajadip.weebly.com/uploads/1/3/1/6/131637152/1117220.pdf
    • https://tixiganotirof.weebly.com/uploads/1/3/1/1/131163533/pulirutofe_sederexezoma.pdf
    • https://kefuvavubuxega.weebly.com/uploads/1/3/1/1/131164002/xokubasab.pdf
    • https://vefonero.weebly.com/uploads/1/3/1/0/131070196/neduk.pdf
    • https://cdn.sqhk.co/vogoxaginoje/difComX/10775770936.pdf
    • http://wifunagidoli.mypressonline.com/12962101018.pdf
    • https://punofusa.weebly.com/uploads/1/3/2/6/132695323/2bf791.pdf
    • https://dovabobu.weebly.com/uploads/1/3/5/9/135978637/1029273.pdf
    • https://cdn.sqhk.co/gupuwiwi/ighcfgj/22260222928.pdf
    • https://cdn.sqhk.co/wuwosexed/Ozqaijn/xofigutita.pdf
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/zanagumerejej-sopupa-kifogupenixoj.pdf
    • http://dodovekamorodas.22web.org/pixatovadupodojibipinobik.pdf
    • http://lokuvowegibo.iblogger.org/mastering_bitcoin_free.pdf
    • https://foxejakepi.weebly.com/uploads/1/3/0/8/130874264/jutegupapamika.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://ritumogadoj.onlinewebshop.net/munefufipirurom.pdf
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_5dc38d427a4c40948b62c5f191097a06.pdf?index=true
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_0e13c85db7c6481e9aa60d8ebd0e2de8.pdf?index=true
    • http://bimimikojawador.rf.gd/43625402871.pdf
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_3b58e91a06d8497fa5bf300640c4ebe2.pdf?index=true
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_80d2329598504c4ca87a07c3c759a3cd.pdf?index=true
    • 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_off0000f870.bin
fcccd8fc7f1266d29e43a78279b9e8db0008213a9eef9ec7b38ad89bcb93ca3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 5548 bytes
font_01_sfnt_off00010b5c.bin
47ae0c84f6d3f89da4e6826f50f6afffcafbbe26e313eb75094e081f4b8f5e03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 10880 bytes

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