Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba7052bde777cb8…

MALICIOUS

PDF

80.3 KB Created: 2021-04-04 10:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71c77f831433aad85ba418928dd48b58 SHA-1: 823bad536b67218168e814243e81e47036480657 SHA-256: 2ba7052bde777cb8a4475b4ac0899aa5ab2c6e07ed71023d9ebf8522e41d9c31
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, with a significant number pointing to other PDF documents, suggesting an attempt to manipulate search engine results or distribute malicious content. The file's structure and the presence of embedded URLs indicate it's designed to redirect users to potentially harmful external sites.

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://maypoin.ru/wix?keyword=ap360+label+applicator+manual
    • http://sapufawo.iblogger.org/simplex_4100_es_manual.pdf
    • https://tozupefiga.weebly.com/uploads/1/3/4/2/134265365/7662293.pdf
    • https://static.s123-cdn-static.com/uploads/4454824/normal_5fe1145d774a4.pdf
    • http://tetalote.22web.org/88465779006.pdf
    • https://cdn-cms.f-static.net/uploads/4417818/normal_60430c303b646.pdf
    • https://kapofered.weebly.com/uploads/1/3/2/6/132680839/zevetagijixu-tuboboje-pixameso.pdf
    • https://pezibufanijazox.weebly.com/uploads/1/3/4/6/134639202/kapifunalamonud.pdf
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/voxiniru.pdf
    • https://cdn-cms.f-static.net/uploads/4414489/normal_5fe6ad8b397f9.pdf
    • https://befuvabesuwab.weebly.com/uploads/1/3/0/7/130740391/9348391.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_603b57b312672.pdf
    • http://rozewudada.iblogger.org/lulus.pdf
    • https://cdn-cms.f-static.net/uploads/4383917/normal_6040647c70ef9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jozizirepimetel.rf.gd/craftsman_850_series_17_tiller_price.pdf
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_67409fbb42be49d9bc63df740e300d1b.pdf?index=true
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_edbd6f9003764fd0b12d6e18c81425d7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eedb063f-c3f6-46f5-a398-b41e07bd0c8b/yale-brown_obsessive_compulsive_scale_y-bocs_en_espaol.pdf
    • http://rilupomonowej.rf.gd/fichas_de_lectoescritura_para_primer_grado.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_5fc7e3b3066e489f9b814f979d33c2d8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/857d336a-8f2d-42f1-8269-dd43f371fb41/usb_turntable_software_for_mac.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcae.bin
34427f52509a656458ac151a5d825c7c154972b81175d5532ee7f2ec4a9cfc40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAE 5492 bytes
font_01_sfnt_off00010f3c.bin
29e7b7af18078618921f00b4dd08ae7f3b2a0d4aae56e9fbb96ca3158afa2cf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 10848 bytes

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