Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76b4e35ce6becde…

MALICIOUS

PDF

71.1 KB Created: 2021-03-24 02:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5415f1bff553c710282e3f82b211db0 SHA-1: 7438bfd68bf60f8f3e6849e39be47c7583b3fe2a SHA-256: f76b4e35ce6becde1d4d1cc37d216e71f0f2b56820314d3d3de802ad4e90e85f
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, indicating malicious intent. It contains a link to `https://jumiwimov.ru/wix?keyword=juzni+vetar+ceo+film+online+srpski`, which is likely used to redirect users to a phishing or malware distribution site. The presence of numerous external links, some pointing to potentially benign content and others to unknown domains, suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=juzni+vetar+ceo+film+online+srpski
    • https://diwetipitas.weebly.com/uploads/1/3/5/3/135327042/6780033.pdf
    • http://goxuladajozi.22web.org/29886698995.pdf
    • https://lulaxifijugom.weebly.com/uploads/1/3/0/7/130776747/6561104.pdf
    • https://gewujezugiwo.weebly.com/uploads/1/3/4/7/134754524/90faf56729d9b4.pdf
    • https://lazedenukijut.weebly.com/uploads/1/3/4/4/134470604/ralolokosub_vixisev_dikazowu_talekasijidi.pdf
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/8278670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/940241b0-d3e0-4ff6-9953-b3550c934e51/50318754302.pdf
    • https://uploads.strikinglycdn.com/files/dc4f9663-5710-48a1-b4cf-c69a60947bab/how_do_you_celebrate_something_virtually.pdf
    • https://uploads.strikinglycdn.com/files/6ff4299e-d832-4ab1-9682-564ca9548464/linking_verbs_worksheet_6th_grade.pdf
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_f292f5a92739468aa127019785fd2fa5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f257bdba-940a-44a3-9085-d1ec163a60df/79642357100.pdf
    • http://fugodijuw.rf.gd/49322344914.pdf
    • https://uploads.strikinglycdn.com/files/d5ef71d3-62da-4aff-9d70-18ff0840ac85/shop-vac_14-gallon_wet_dry_pump_vacuum.pdf
    • https://c779a0a5-5a96-4308-8c37-720837e0bdd2.filesusr.com/ugd/4f1d02_0b6e3e82e4cd4bd987dd9c323aa6b5cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/be19967a-1c43-4fb9-a879-0b7c7d150c1a/how_to_manage_a_team_as_a_team_leader.pdf
    • https://uploads.strikinglycdn.com/files/1e8cf3a9-00eb-4df8-9779-bc85eafed790/12854926086.pdf
    • http://dopapaxejoj.epizy.com/blockchain_application_and_outlook_in_the_banking_industry.pdf
    • https://f78a7b13-e75c-4ddc-9f3c-03cd83736f6c.filesusr.com/ugd/90c53f_65e5a5a12d2943ea9c446c1a01d90060.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_off0000d4cf.bin
d6998a67e16e139c5c53980c560f2f02459fa11384f28d9737297b1576b3ed71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CF 5324 bytes
font_01_sfnt_off0000e6ea.bin
354ed0512164c35883d68efdb54ee810c34c8890c663e87bbbe74c5ad12cf0a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EA 12664 bytes

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