Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f753eb981a5756…

MALICIOUS

PDF

80.2 KB Created: 2021-03-10 08:52:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c5dcffdfcb4b2e31e6598bad6652c6d SHA-1: 2ac202a802dd1741027620ee0acb455f0c974b23 SHA-256: 12f753eb981a575627f769863dfbf250c660a33bcebbe8f863a17ac50724fcf8
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating it functions as a PDF SEO link farm. It contains numerous external links, including suspicious domains like 'passive-income.ru' and 'zajinet.ru', suggesting an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure itself is weaponized to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/aws?utm_term=hp+probook+6550b+parts
    • http://passive-income.ru/50756060028qi04l.pdf
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/7014674.pdf
    • http://fdvsefwfrw.space/554268480785o499.pdf
    • https://sisuveraxom.weebly.com/uploads/1/3/2/7/132740665/deporudiwurotopenine.pdf
    • http://dopenukivo.22web.org/2097242825.pdf
    • https://nufirejibojo.weebly.com/uploads/1/3/4/6/134645492/meguresebe-milokesaxexom-rupip.pdf
    • http://verifedform.com/2709245321685wnp.pdf
    • http://mazanaposiwos.iblogger.org/pojunapalev.pdf
    • https://figovuliwa.weebly.com/uploads/1/3/4/4/134476313/097af87afd.pdf
    • https://puduwuxibipufu.weebly.com/uploads/1/3/5/9/135966859/ea0a3ce864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/392b98c6-6006-43e7-a5ed-db7681dae977/graco_fastaction_fold_jogger_click_connect_stroller_orange.pdf
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_91f242d3d18c4531b0acdad6eaf0033d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/57e08295-92a9-440a-918e-c1ecc258c363/what_is_the_structure_of_a_rock_song.pdf
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_285654eb2c0e420db39314e9c6506e0f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bdfe8388-cbdf-4173-a162-f34746040784/6455735219.pdf
    • https://uploads.strikinglycdn.com/files/34d0122c-f068-4e18-b825-7585f5ea0e13/35802653300.pdf
    • https://uploads.strikinglycdn.com/files/cc5ff7f7-800c-4ad6-b024-8880dba1a434/el_seor_de_las_moscas_pelicula_online_latino.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_19a4d03b2af043d49ad6a931a717a141.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8fac83f2-bc4d-44f9-9fbb-d31799fa9d11/siemens_plc_programming_tutorial_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/c035b445-ced3-4de8-b817-7ba81fc4cd2b/pumedotidenajisisakitimu.pdf
    • https://uploads.strikinglycdn.com/files/5b9fe2d5-dc06-473c-98d6-0f6249257b27/how_to_draw_step_by_step_easy_girl.pdf
    • http://welavozolin.rf.gd/recognize_text_in_a_scanned_file.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_off0000fafd.bin
bdbadd242ff3c7ce4879426bbb82ed665f7b005ccb49db3ca0af7348e9ced244		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 5364 bytes
font_01_sfnt_off00010d45.bin
57e40bd7127cee1b00729871ca9cdd12a1861bb9ae98cbce4f405fe58462d37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 11308 bytes

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