Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b839d33d11f49ad…

MALICIOUS

PDF

72.3 KB Created: 2021-04-05 15:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3ceb95b81fab3aedc006af0e06586e63 SHA-1: 8e18cee0a321a65317465eb46349de2fb3d4014f SHA-256: 3b839d33d11f49adb3dc44dfe615a37c1a5c7624d06f80e36ebdf2db45e830ea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://vilenefex.ru/award?keyword=que+es+la+auditoria+de+estados+financieros+pdf PDF link annotation
    • https://cdn.sqhk.co/xoradofexul/chjDHXx/drunkn_bar_fight_psvr_alley.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388416/normal_6024198c359c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5fd98dd0a17a6.pdfIn PDF document text
    • https://cdn.sqhk.co/dukapudubi/ChfgiEW/sani_cloth_af3_coronavirus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_600a0893217d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421350/normal_601a644721e37.pdfIn PDF document text
    • https://cdn.sqhk.co/javeduner/hd8ijhi/warhammer_fantasy_roleplay_adventures.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447884/normal_603444e179df9.pdfIn PDF document text
    • http://parralax.net/which_is_the_best_water_dispenser_in_indiauri7z.pdfIn PDF document text
    • http://hopecommunitynaz.com/formulas_de_la_parabola_y_sus_elementos422nl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366018/normal_5fe4fe4c236bc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1b3e2d6a-0348-4772-9bb2-16e56a761455.filesusr.com/ugd/7bcf02_49bc2bd972264a67903a91852f745c1e.pdf?index=trueIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_c3db93c0addb41c8a1643c3339080094.pdf?index=trueIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_a81b0877cf2940d8b5231637df76fb9f.pdf?index=trueIn PDF document text
    • http://tujevudaxuxos.epizy.com/mapleroyals_joon_bishop_guide.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_940a926b4cb94300a0e427dea81be6d0.pdf?index=trueIn PDF document text
    • https://0029a690-d003-4268-bdc7-e74daa5a0415.filesusr.com/ugd/a4b355_c394d9a56b794ac08483d7cb4b041050.pdf?index=trueIn PDF document text
    • http://sujosivetobifir.epizy.com/97670988810.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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 5212 bytes
SHA-256: de9ff9f231932a4ad899acf2f5af19d27b4b611c3a5e8ca4673ce907aeaf9360
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 10960 bytes
SHA-256: 5919960288d7c09ddfe9d476f646b018492d38e789a2c96ffed7497454d3c0a8

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