Malicious PDF — malware analysis report

Static analysis result for SHA-256 876105bf8b578a4e…

MALICIOUS

PDF

77.0 KB Created: 2021-03-18 00:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ba42b5030839dba1cb735678f2c970f SHA-1: 2b416200d164d1edf259c9d1934d083267e16366 SHA-256: 876105bf8b578a4eea80316cfe8755040a8eff4c09705691e522f58b42373636
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or phishing campaign. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a keyword that could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://zajinet.ru/wix?keyword=bucket+ball+beach+game
    • http://luxasireku.sportsontheweb.net/catalogo_mary_kay_2020.pdf
    • https://gaparomid.weebly.com/uploads/1/3/4/6/134632142/5715287.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_601490c63098b.pdf
    • https://static.s123-cdn-static.com/uploads/4446399/normal_5fe392fca6387.pdf
    • https://roxadaxakisa.weebly.com/uploads/1/3/1/4/131437443/e24752920.pdf
    • https://static.s123-cdn-static.com/uploads/4468286/normal_5fddd383bcc9c.pdf
    • http://delozofize.scienceontheweb.net/employment_insurance_sickness_benefits.pdf
    • https://winugemu.weebly.com/uploads/1/3/1/0/131070294/78db370f.pdf
    • https://cdn-cms.f-static.net/uploads/4422371/normal_604cebf02b756.pdf
    • https://fudegedetet.weebly.com/uploads/1/3/4/7/134733785/xazekokadasal.pdf
    • https://cdn-cms.f-static.net/uploads/4458125/normal_603613e856885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_6ed4073714614c5eb8528c9f7928e92b.pdf?index=true
    • https://s3.amazonaws.com/zomuzigo/urine_culture_report_sterile_means.pdf
    • http://xowobovu.myartsonline.com/beef_cattle_production_manual.pdf
    • https://57ead060-d7b3-4f59-a803-6c9b47c0028a.filesusr.com/ugd/f30481_5467049fb6f64abfa0466459cda68cb8.pdf?index=true
    • https://s3.amazonaws.com/jalasilunaz/lady_antebellum_heart_break_song.pdf
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_ed553f9ca8f841309396e055a809646e.pdf?index=true
    • https://s3.amazonaws.com/tobojelusiwi/vupoxojuputebom.pdf
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_b18203659d8e4422935ed66625695822.pdf?index=true
    • https://s3.amazonaws.com/fedojigudaj/17753702124.pdf
    • https://s3.amazonaws.com/senodiw/nefuvadesemularinunabewi.pdf
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_1cdfe36822a848528b2e415c9220a055.pdf?index=true
    • https://s3.amazonaws.com/fipijife/akreditasi_ban_pt_ut_2018.pdf
    • https://s3.amazonaws.com/vojapu/52643730351.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_off0000f013.bin
605863c3e2aef347f36167c3dc3b281b47e051d6750589c4a68062dad6b7cec4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 5192 bytes
font_01_sfnt_off000101a6.bin
5d5f54125792870d2f88c9e30dae4688417c4919727fe2b269ff05d5e79e90c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 10804 bytes

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