Malicious PDF — malware analysis report

Static analysis result for SHA-256 e878ab38949c3d7f…

MALICIOUS

PDF

82.4 KB Created: 2021-04-10 20:40:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afeb4e4ef3e95830681e293d4750ad59 SHA-1: 1bda773a78858d7d6873c73eb94ca7bc43b766ac SHA-256: e878ab38949c3d7f145714a317c95ff9cd7d4a6445282ac20900e8b65aa65e40
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a "mass external PDF link farm". The primary malicious URL, https://vilenefex.ru/strik, is likely used for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, possibly involving embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=grounding+exercises+for+group+therapy
    • https://tufafoselebore.weebly.com/uploads/1/3/5/3/135389740/wuvezusoxuzopibunib.pdf
    • https://nomibazet.weebly.com/uploads/1/3/1/4/131437462/pezorede.pdf
    • https://gagegopered.weebly.com/uploads/1/3/4/8/134880179/1314481.pdf
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/porifafix.pdf
    • https://dujisiseruw.weebly.com/uploads/1/3/0/7/130776106/mavodukeb.pdf
    • https://cdn-cms.f-static.net/uploads/4405194/normal_603504efad754.pdf
    • https://cdn-cms.f-static.net/uploads/4392237/normal_5fda815c79549.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_65639a12cb594dd28a5bece039c14458.pdf?index=true
    • https://s3.amazonaws.com/guwutivupudutu/43757747163.pdf
    • https://uploads.strikinglycdn.com/files/ab3487dd-7a2a-43d8-b20f-ee99244fcb5d/86454900449.pdf
    • https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_d03af4a8e466447e92070b632cbcc09c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/26e9181c-1c0e-4912-a3ad-2d21a25a8478/78423323812.pdf
    • https://uploads.strikinglycdn.com/files/aa5b238c-e983-4ef1-8f7b-bf3594c82093/corporate_social_responsibility_definition_scholarly_articles.pdf
    • https://291e86d0-b4b7-455e-aeca-30cd05102b29.filesusr.com/ugd/384a46_f5bb3dce55914962b90c441ecdff9040.pdf?index=true
    • https://45884d5c-3037-4093-99f9-9b9c28a1e9f0.filesusr.com/ugd/3721b1_070ad34ceacd4b2daf8dd820c1636394.pdf?index=true
    • http://vomogowejupilu.rf.gd/70623370565.pdf
    • http://tasodeporojunez.epizy.com/ds_emulator_roms_for_android.pdf
    • https://uploads.strikinglycdn.com/files/a49e8f55-1779-416f-8588-6aa46fec2a57/norumazu.pdf
    • https://s3.amazonaws.com/dikomavomem/is_there_monsters_vs_aliens_on_netflix.pdf
    • https://uploads.strikinglycdn.com/files/ab34a218-c696-4099-a64a-9662a3cbd98c/craftsman_675_series_lawn_mower_bag.pdf
    • https://s3.amazonaws.com/penefelomiju/rmit_application_form_2018.pdf
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_f569ec122d3940e18078147c1ff9b518.pdf?index=true
    • http://jezitezeveveta.epizy.com/antibiotics_simplified_2020.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f012.bin
5c46b5924b6417717ea63b5c5998b510eb86541b3813d619f4f02b0ba8d1b847		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5584 bytes
font_01_sfnt_off00010323.bin
af074d26d42d188a6643cd411ec07ee54b8e27c64159031ec26c9c4d88bea7ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 10420 bytes
font_02_sfnt_off00012707.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16060 bytes

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