Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c344275afe5ea6d…

MALICIOUS

PDF

91.3 KB Created: 2021-03-11 21:59:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b9ee192b126ca68230ff405282bc2e6 SHA-1: b9a0ea7fdf6d95b5e438b22406afe75092505dc1 SHA-256: 8c344275afe5ea6df345a8f59fd0040383d151b135b41da9d37462ce9f227e81
176 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO manipulation tactic. One URL, 'https://botokaw.ru/123?utm_term=cardinal+health+pro+series+refrigerator+manual', is flagged as unknown reputation and appears to be the primary lure. The 'SE_CALLBACK_LURE' heuristic indicates the document may also prompt users to call a phone number, consistent with phishing or tech-support scams. ClamAV also detected this as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://botokaw.ru/123?utm_term=cardinal+health+pro+series+refrigerator+manual
    • http://janurikemodowu.iblogger.org/13371994459.pdf
    • https://gonadasefu.weebly.com/uploads/1/3/5/3/135345348/33934c6e622a7.pdf
    • http://kewegagibemidaj.22web.org/80554258231.pdf
    • http://lidagejelotodu.22web.org/introduction_to_accounting_and_financial_statements.pdf
    • https://zepafasamog.weebly.com/uploads/1/3/4/3/134361306/717c40a54adbd1.pdf
    • https://cdn.sqhk.co/gewanunu/hijfJu8/freedom_mortgage_rates.pdf
    • https://rogifegupoxixo.weebly.com/uploads/1/3/4/0/134040774/7777d401e337.pdf
    • https://bupekotarox.weebly.com/uploads/1/3/0/7/130739944/xikikofozosatetitiv.pdf
    • http://negeduji.66ghz.com/10773526750.pdf
    • https://cdn.sqhk.co/neseleko/tijibTZ/bollywood_instrumental_songs_2019_mp3_download_pagalworld.pdf
    • https://sonikegusu.weebly.com/uploads/1/3/3/9/133997348/nenoma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/153f8ae7-5809-4ead-8c40-d5d7bd48ca55/lumotupovo.pdf
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_6333e4abaa934aeeb7510c9fee38c472.pdf?index=true
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_93467abe22fa4cab85fd13f8f66eb163.pdf?index=true
    • http://rimiwomo.epizy.com/peak_jump_starter_750_charger.pdf
    • https://4e4301d6-cc9a-4939-960a-6b497c1efea6.filesusr.com/ugd/d78803_acb6564cf4574d2cb59bea85598ce46c.pdf?index=true
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_f7f0b2a559554963b952eeeeb6f66404.pdf?index=true
    • https://s3.amazonaws.com/jivuxo/decimal_to_fraction_sheet.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_cfa32a7308f947ffb2dd107ad87d52ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/977f1675-9e40-4b7c-bf5e-1cfd5312c1dc/9248167552.pdf
    • https://s3.amazonaws.com/tezofuretejom/53036807179.pdf
    • https://uploads.strikinglycdn.com/files/8f87f737-0c1b-416b-9628-7a7a11d9d228/weather_map_worksheets_6th_grade.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_off00012525.bin
5ceadd4117a1875ee9c26bd7373d60f13b0cba64a2358dc2e2d9c12d56f2f5ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12525 5360 bytes
font_01_sfnt_off00013730.bin
5309f44f762ddeebf3bdbfe085ed08e6155a375b342bd1a412355187aa4c8d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 12332 bytes

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