Malicious PDF — malware analysis report

Static analysis result for SHA-256 766a81a11289acac…

MALICIOUS

PDF

87.9 KB Created: 2021-03-26 10:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5db5188cbcdf39629d8d9118263c97a4 SHA-1: 7d2472df3fcdc4ea1e4e6c8e53ca31930272731a SHA-256: 766a81a11289acac7d18691fcfa739d8ff89fe55701b58afd6f88842f6058732
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or a method to distribute further malicious content. The document body, though heavily obfuscated, appears to be a lure related to a 'data center physical security audit checklist'. No scripts were extracted, but the presence of numerous external URLs indicates an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pelibifir.ru/strik?utm_term=data+center+physical+security+audit+checklist
    • https://static.s123-cdn-static.com/uploads/4484363/normal_600858f0194f1.pdf
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/majejiba-gapuziwiwugo-regilowid.pdf
    • https://cdn.sqhk.co/fikalibumi/ijCHchi/54455880621.pdf
    • https://cdn.sqhk.co/wovupeni/pCjdcF5/blood_pressure_machine_omron_m2.pdf
    • https://vuxabodunufa.weebly.com/uploads/1/3/1/4/131407539/jivisuwiwula-vedunegu-gozumerowogagez.pdf
    • http://xasedogamif.mypressonline.com/dopilivowelujimivisu.pdf
    • https://rasizuxuner.weebly.com/uploads/1/3/1/3/131378923/62e8f5b51.pdf
    • https://cdn.sqhk.co/miloxuso/tqhfjee/nizulipuzuwetasozosajo.pdf
    • https://defiduzumuxel.weebly.com/uploads/1/3/2/6/132682342/tegugisapemaj.pdf
    • https://cdn.sqhk.co/sujubowip/Fpjbcox/1_pics_1_word_what_the_word_6.pdf
    • https://cdn.sqhk.co/fetumamuv/Kipgjia/72393849479.pdf
    • https://cdn.sqhk.co/jebixusugak/Hjihjww/biguxego.pdf
    • https://cdn-cms.f-static.net/uploads/4387921/normal_5fe95178f0631.pdf
    • https://cdn.sqhk.co/batumozi/7jbkMja/81661070759.pdf
    • http://bufezipuduxev.mywebcommunity.org/wofabevikakototubejugij.pdf
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fe18faf83868.pdf
    • https://cdn.sqhk.co/wifinalimow/jgPf7UF/ronafalivugakinisugu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://wavexijazibivat.myartsonline.com/80507989582.pdf
    • https://uploads.strikinglycdn.com/files/911cc524-ecf2-49b4-a612-48cfd69d2fb9/who_was_originally_cast_as_tessa_in_after.pdf
    • https://uploads.strikinglycdn.com/files/ed52f172-bb20-41cd-9b3f-31a163f00610/what_does_the_power_of_one_mean_math.pdf
    • https://uploads.strikinglycdn.com/files/25b5868c-6070-4f52-9931-e360cd6b14c9/60575535425.pdf
    • https://uploads.strikinglycdn.com/files/a96ece61-ec6a-4db6-a65e-fc0f4226a743/how_to_start_forex_trading_in_kenya.pdf
    • https://uploads.strikinglycdn.com/files/c6efdd8a-c9bf-4ad4-926f-5229dd37fbb5/15309387936.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db4.bin
783df566877b796b0faaaad0bfad17fe5a709c621d089b93fd48483e8b9d4933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB4 5100 bytes
font_01_sfnt_off00011efc.bin
e3513c48006777ac1349ed13c2ffea34c3bdcb743194e6d053a27cda4264e5ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 10604 bytes
font_02_sfnt_off00014329.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14329 4324 bytes

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