Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe9549b8b0284cd…

MALICIOUS

PDF

79.6 KB Created: 2021-04-12 11:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1036641391716132db3902ca14617639 SHA-1: 60bed9f753eb3c7b2d37a5109806fbed8c897856 SHA-256: cfe9549b8b0284cdce6627d401c5d08563fa36db28c3e93073772b9593585cf7
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains. The heuristic 'SE_CALLBACK_LURE' indicates a callback phishing or tech-support scam pattern, suggesting the document's primary purpose is to trick users into contacting malicious actors. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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.
  • 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://bologen.ru/strik?utm_term=how+do+you+remove+the+battery+from+an+alcatel+phone PDF link annotation
    • https://towutibe.weebly.com/uploads/1/3/4/0/134012467/sajomege.pdfIn PDF document text
    • http://gapokaro.mywebcommunity.org/72004528815.pdfIn PDF document text
    • http://biotringel.shop/kenmore_refrigerator_795_freezer_not_workinglzbu4.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/agency_theory_indonesia.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/jujipedebidow_gagadulakoz_bawefe_jekijijovubuja.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/62138838424.pdfIn PDF document text
    • https://kinezamoz.weebly.com/uploads/1/3/4/7/134745204/vebusidaveruxuwogu.pdfIn PDF document text
    • https://duwesokele.weebly.com/uploads/1/3/1/6/131606866/0ab3d027e82.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/somuvudixinabaze.pdfIn PDF document text
    • https://pofofeteb.weebly.com/uploads/1/3/2/6/132681268/totanevatuka.pdfIn PDF document text
    • https://tuvaxijilitug.weebly.com/uploads/1/3/4/6/134668501/e70d610fe6864.pdfIn PDF document text
    • https://fopisurotow.weebly.com/uploads/1/3/0/8/130874034/3000718.pdfIn PDF document text
    • http://weex.info/50204632608b8v92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_4894a4f703ff43c78cf7d0a87b111e72.pdf?index=trueIn PDF document text
    • http://disoluje.myartsonline.com/vugijunametalaxen.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_9530513b1d85495788d72d85373f2acb.pdf?index=trueIn PDF document text
    • http://gozidonozali.myartsonline.com/pepivuwa.pdfIn PDF document text
    • https://368af19b-b9be-4417-8ea7-dfc4611f9fec.filesusr.com/ugd/abd4c0_6a2dd44c591a4579b34315daf4141132.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_2165377ed74c455da56468ceec4960b0.pdf?index=trueIn PDF document text
    • https://add83a7c-0e31-48b3-928b-061d82ba9144.filesusr.com/ugd/205ae4_275db37ba33c405db4540eedf366f36d.pdf?index=trueIn PDF document text
    • http://vakizonozajaxe.onlinewebshop.net/minitab_statistical_software.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_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 5572 bytes
SHA-256: 712130750ff20b70db9780a134d609b1b6e2dcde99a58d9c8a5ff59cc11d992d
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 11220 bytes
SHA-256: f0e1f757936f1a2e113fbe74cc9fb95f76708fe971ddfde3796c5a460741959a

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