Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3effa67ef86b89d…

MALICIOUS

PDF

87.0 KB Created: 2021-03-18 20:51:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 68690ba0e3589845b82c769fd32bfc59 SHA-1: 17a1c5d53f0ab3c433a87a88d26cec6618a1298a SHA-256: c3effa67ef86b89d355c4b2c29ef4ad95ddf80e22464dedb25488522b4feced6
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 hosted on free web hosting services and appear to be part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to search engine optimization or document content.

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://leonvi.ru/award?keyword=que+es+el+cemento+portland+pdf
    • http://goduvide.22web.org/august_telugu_calendar_2018.pdf
    • http://pumba.fun/blastall_output_format47lou.pdf
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/favifijopipunopawe.pdf
    • http://paypallsecurity.com/35782819676v3d9.pdf
    • http://neyroskakalka.site/what_to_write_in_a_faith_statement11d95.pdf
    • http://usene.xyz/their_eyes_were_watching_god_pageseysi3.pdf
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/zararowopewexuguxatu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tobizexajivuvob.epizy.com/buwede.pdf
    • https://s3.amazonaws.com/fuwawibu/b_p_l_of_full_form.pdf
    • http://motakajukig.epizy.com/95749465861.pdf
    • https://s3.amazonaws.com/tufujifinobiro/mumonepomasaf.pdf
    • https://s3.amazonaws.com/vedexajawo/60364336169.pdf
    • http://puburibiv.rf.gd/maithili_sheet_basant_ka_nach.pdf
    • https://s3.amazonaws.com/jinabom/grievance_policy_template_south_africa.pdf
    • http://tofezaniv.rf.gd/34057962412.pdf
    • https://s3.amazonaws.com/kagedatabujo/vojazozenaguwawawivizikoz.pdf
    • https://s3.amazonaws.com/xifabilejilab/18694049013.pdf
    • https://s3.amazonaws.com/loxopudizus/naximataxukapuwunorisa.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_off0001127e.bin
147573a0a43f301a0ca151ad8e1d92aab034791d9b095f99c557ac5238376f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 5360 bytes
font_01_sfnt_off000124a1.bin
8a2869fb027c2eb6dc016b0d46b683401f837631572de9864a3a5dc613c80e29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124A1 13172 bytes

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