Malicious PDF — malware analysis report

Static analysis result for SHA-256 433822699e1739c0…

MALICIOUS

PDF

88.1 KB Created: 2021-03-29 18:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b46b5f65fc4a0a77aa992d718fb22d3 SHA-1: 21bfce27863047a30f2e97d4accf189210d31831 SHA-256: 433822699e1739c01c6064327d73e84c9ef19a87310ed3366e196279bb56e66b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO poisoning and phishing. The embedded URL and the heuristic firings indicate a phishing attempt disguised as a search result, likely leading to a malicious website. No scripts were extracted, but the PDF structure and link farm heuristic strongly suggest a phishing or malicious redirection scheme.

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-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://botokaw.ru/wix?keyword=jean+jacques+rousseau+emile+pdf
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/rulamemaxuri-fapikodewow-lofigowoj.pdf
    • http://goldstein.berlin/vigefaledigodowegoneltfq8.pdf
    • https://surumisaw.weebly.com/uploads/1/3/4/7/134707241/xigoselagarisija.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_603f10e98fd62.pdf
    • http://gouliwer.online/navy_uic_329156hbst.pdf
    • http://pikejofopon.mypressonline.com/ancient_egypt_history_download.pdf
    • https://tizizuner.weebly.com/uploads/1/3/1/8/131872037/kajamexenati_damelolodexow_xevot_viwidavexasazik.pdf
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/dead5db.pdf
    • https://static.s123-cdn-static.com/uploads/4482671/normal_5ffa263533b43.pdf
    • https://cdn-cms.f-static.net/uploads/4502493/normal_600a43953f634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dubiditiginowo/67756444438.pdf
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_9e78d9c0534e4d588d3da75ee5d89f00.pdf?index=true
    • https://s3.amazonaws.com/dugibabafod/85827162175.pdf
    • https://s3.amazonaws.com/kigavanus/axon_ivy_engine.pdf
    • http://nukivamo.myartsonline.com/gusutiv.pdf
    • https://s3.amazonaws.com/figidireki/sugumalerumada.pdf
    • https://s3.amazonaws.com/fogibi/digraphs_worksheets_4th_grade.pdf
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_9ba11d123cf84e81b0ca1003b951f6aa.pdf?index=true
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_f50fce8893404f55aaf2ed81476fbc9d.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cb2.bin
1850736ca656cd1764ca557a2b4e6f66b4505d060febe7367ebb7536b27b28f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 5292 bytes
font_01_sfnt_off00011e90.bin
efd40dc45a84fdef9b08e1a98b33cb7d620728d999f1c57306afd1aed4024727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 11540 bytes
font_02_sfnt_off000144c3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144C3 4324 bytes

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