Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d2946c94f361273…

MALICIOUS

PDF

110.3 KB Created: 2021-04-20 06:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5f5706e4f33a1bf6836c34fc65b4a8b SHA-1: 763ccfbfbd2e8f56ccf8238bbd2b96b6410bf18f SHA-256: 7d2946c94f361273b501eb0674c9c9de2daaa2024f1c5002a95764e934358a65
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=what+does+zao+mean+in+mandarin
    • http://xivobivivupe.mygamesonline.org/cfa_curriculum_2020_level_3.pdf
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/16104.pdf
    • https://taxinureku.weebly.com/uploads/1/3/0/8/130814469/fonif.pdf
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/da3c9dee2975.pdf
    • https://sazizilas.weebly.com/uploads/1/3/0/8/130874530/1d62dc63.pdf
    • https://cdn-cms.f-static.net/uploads/4487194/normal_6034d7785e687.pdf
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/sogokogapu-kokutijolegotov-wodowilenuzi-posikugijopip.pdf
    • https://zokatitolef.weebly.com/uploads/1/3/4/7/134702636/biruze-zubika-xozuradulov.pdf
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fd0524de93c4.pdf
    • https://buseziji.weebly.com/uploads/1/3/1/3/131398529/zegavifizibuf.pdf
    • http://kuvezowepo.scienceontheweb.net/wigoxagiw.pdf
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/0bcf1967cb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_3bc3de1db28040dca60fa7696ae2f034.pdf?index=true
    • https://s3.amazonaws.com/jubiferekaka/certificate_of_achievement_template_google_docs.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/bulavelijulopudira.pdf
    • https://s3.amazonaws.com/tinivukedeta/instagram_video_post.pdf
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_e5a3064522be4ac79cf721e55549b9d2.pdf?index=true
    • https://s3.amazonaws.com/fixararololu/92134708326.pdf
    • https://06b91503-bda4-4bbd-a69c-520552d4e402.filesusr.com/ugd/07c5d0_17c22495880b47a5a95ed00502ae2813.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010df6.bin
119229f8a07120328ae8a4d82111203512e0c6b32a2eccac9dbe06db3915d454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 28424 bytes
font_01_sfnt_off000162dc.bin
15cd38083e1c3fb9fce2d936dbaf860bfa08f888e8d63e63738242292ed020ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162DC 4884 bytes
font_02_sfnt_off00017355.bin
5b8845e2e6d4c0057c1b610e4c174f6476e253757a038b75070c84fa2fe45eb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17355 13268 bytes
font_03_sfnt_off00019b50.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19B50 4324 bytes

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