Malicious PDF — malware analysis report

Static analysis result for SHA-256 70d739e65c9f5c00…

MALICIOUS

PDF

87.3 KB Created: 2021-03-25 03:01:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40f9603c149f97f673ab237ef8484cfe SHA-1: d4ce4040aec529bbc212515c887a9444b0ea23b9 SHA-256: 70d739e65c9f5c00863030daefb5b3fbad862c3f804338eec302f58701ca117a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a large link farm pointing to external PDFs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to malicious content, potentially leveraging the 'game' lure found in the document metadata.

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://kuzutuzo.ru/wix?keyword=super+sonic+flash+2+game
    • https://cdn.sqhk.co/xeduwukaxusa/9idNjhh/tropicool_chiller_reviews.pdf
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/togidasubosufuxidida.pdf
    • http://zuzutogutid.22web.org/quipper_untuk_laptop.pdf
    • https://cdn.sqhk.co/velizovatim/Lhehggi/lemuviwela.pdf
    • https://cdn.sqhk.co/benibavagoge/hecowii/neperofufonuxibova.pdf
    • https://cdn-cms.f-static.net/uploads/4476429/normal_5fd24287b7681.pdf
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/7837628.pdf
    • https://cdn.sqhk.co/zukasedu/j7gghhD/jimusiwidazisuzupirinalu.pdf
    • https://belanuxaru.weebly.com/uploads/1/3/4/6/134670531/4983432.pdf
    • https://cdn-cms.f-static.net/uploads/4485152/normal_601548a56b524.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://getitusedoniriv.epizy.com/akomodasi_mata_adalah.pdf
    • https://s3.amazonaws.com/faxaxos/renewable_energy_sources_ppt_templates.pdf
    • http://mumamame.rf.gd/50879766649.pdf
    • https://s3.amazonaws.com/rorives/78033942679.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_a89a38d6731c43c993a63750a02cc12b.pdf?index=true
    • https://s3.amazonaws.com/serogajugomiji/77827547896.pdf
    • https://s3.amazonaws.com/rujimidujek/martin_luther_95_theses_meaning.pdf
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_520826586c3846d3a60c694e827291e4.pdf?index=true
    • http://xojazexodiwosi.epizy.com/argentina_primera_b_league_table_and_form.pdf
    • https://s3.amazonaws.com/gelawiweza/security_incident_reporting_form_template.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_off0001184c.bin
5bb3530044eb8959bbdbe0ad78ac5a5b626039125cb565cba05a8c0fb7a8c17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 5664 bytes
font_01_sfnt_off00012b70.bin
8db98b7669f649888cca28302fdcaac85a2316eac05c482a878d5a503b3958b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B70 10732 bytes

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