Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd91e662221b248…

MALICIOUS

PDF

83.0 KB Created: 2021-04-05 21:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdb51466b632f926a78afa8fb07b825c SHA-1: 79d587ea3ac778891b8a25c52b95c9b00565283c SHA-256: 7cd91e662221b248f3ed8fd97a0fc8d712368f584559e2724e2993c513742aab
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://pelibifir.ru/strik?utm_term=how+to+tame+a+wild+tongue+short+summary, which is likely used to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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
  • 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://pelibifir.ru/strik?utm_term=how+to+tame+a+wild+tongue+short+summary
    • https://cdn.sqhk.co/takularozo/eib2mJt/glitch_lab_pro_apk_download.pdf
    • https://cdn.sqhk.co/nepajenine/Hjf1jbG/the_hundred_years_war_summary.pdf
    • https://vutuwoti.weebly.com/uploads/1/3/4/7/134720014/dudedowemumepafovanu.pdf
    • https://cdn.sqhk.co/bazexolareja/Xhh8VDe/business_information_systems_job_titles.pdf
    • https://cdn.sqhk.co/batijuretak/hdhdBji/84055284287.pdf
    • https://tebizojejifijof.weebly.com/uploads/1/3/4/5/134589629/8474110.pdf
    • https://pememeva.weebly.com/uploads/1/3/0/8/130874233/669242.pdf
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/7af96bcbe2ef6a.pdf
    • https://cdn-cms.f-static.net/uploads/4422627/normal_602d568c451e5.pdf
    • https://cdn-cms.f-static.net/uploads/4458421/normal_6048c2d826c5d.pdf
    • https://cdn-cms.f-static.net/uploads/4394062/normal_6043b2d5e2f81.pdf
    • https://static.s123-cdn-static.com/uploads/4414494/normal_5fc92a86cdbaa.pdf
    • https://cdn.sqhk.co/zoribakim/2J1m6ig/wwe_smackdown_vs_raw_2007_roster.pdf
    • https://cdn-cms.f-static.net/uploads/4381730/normal_6052e4d3cc2fc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/a45d266e-ffa3-4718-a8c3-2e232618f1ed/zovazojubeve.pdf
    • https://uploads.strikinglycdn.com/files/9c5b8723-7819-4714-91c0-9b5eeff77a86/rurezavawepirix.pdf
    • https://s3.amazonaws.com/woxotopapozokev/depedenadumatulinevew.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/kenmore_front_load_washer_not_spinning.pdf
    • https://s3.amazonaws.com/towutoginadivu/medirid.pdf
    • https://s3.amazonaws.com/fatikonavori/computer_desk_build_guide.pdf
    • https://s3.amazonaws.com/ginutu/figemegiwelitinavometi.pdf
    • https://uploads.strikinglycdn.com/files/4172cdc1-7014-40ae-b81d-59822ba7bd6b/muwifosuxafosivaxafu.pdf
    • https://s3.amazonaws.com/jupoti/is_citizen_a_nice_watch_brand.pdf
    • https://s3.amazonaws.com/neviwove/89129840050.pdf
    • https://uploads.strikinglycdn.com/files/3b4f39f0-ab42-4bcd-ae83-c40ce18a3b6b/wubemobo.pdf
    • https://uploads.strikinglycdn.com/files/95af1c80-482e-493d-8f32-9223fee114e6/what_would_happen_to_a_plant_left_in_the_dark.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb39.bin
5db10cc191b42786dba58332927efdb6fc1df3852e299aabcfec7ae7ab46c534		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 5276 bytes
font_01_sfnt_off00010d07.bin
ccc2ae9fc9e745c1fd2c0756d2a335e5a5542763b206076e4d65626e223fdabf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D07 10348 bytes
font_02_sfnt_off00013012.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13012 4324 bytes

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