Malicious PDF — malware analysis report

Static analysis result for SHA-256 7559f19c6c7c1b69…

MALICIOUS

PDF

85.9 KB Created: 2021-04-16 06:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2de553ee239a7872f8e4477751dfc467 SHA-1: 727bea371075b80b9a96857ec0851ce12242f090 SHA-256: 7559f19c6c7c1b694c1a11da7e428143bd0bc5763d69deaec47deee44797c490
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, suggesting a link farm or redirection scheme to distribute further malicious content. The document body, though partially obfuscated, mentions 'Types of views technical drawing' and the authoring application 'wkhtmltopdf', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/strik?utm_term=types+of+views+technical+drawing
    • https://static.s123-cdn-static.com/uploads/4377120/normal_5ff9c83c24738.pdf
    • https://nurerimufiwovu.weebly.com/uploads/1/3/4/3/134394752/c051110cfce9f99.pdf
    • http://rozogididibusar.sportsontheweb.net/acta_constitutiva_mexicana.pdf
    • http://bamiluzigu.mygamesonline.org/buddhist_books_sinhala.pdf
    • https://static.s123-cdn-static.com/uploads/4445877/normal_6004858ada7e5.pdf
    • https://cdn-cms.f-static.net/uploads/4428054/normal_6023f0c375738.pdf
    • https://static.s123-cdn-static.com/uploads/4501995/normal_5fd060e6bc5f0.pdf
    • https://cdn-cms.f-static.net/uploads/4485568/normal_601b3d8b43f97.pdf
    • https://derifopo.weebly.com/uploads/1/3/4/4/134490925/bejodenu.pdf
    • https://static.s123-cdn-static.com/uploads/4383922/normal_5ff18ec8bb9e0.pdf
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/barakesufegum.pdf
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/gutanopekelerol.pdf
    • https://cdn-cms.f-static.net/uploads/4446512/normal_5fe8ac11eb92a.pdf
    • https://muwivagejexe.weebly.com/uploads/1/3/1/3/131379070/d010537.pdf
    • http://rafupofamurawaf.mygamesonline.org/70561249365.pdf
    • https://wajonurogizi.weebly.com/uploads/1/3/0/7/130738566/sategurokibikokiwi.pdf
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/ba97b6.pdf
    • https://lomekizawulom.weebly.com/uploads/1/3/4/7/134704223/jegised-filezotugesivu-wogib.pdf
    • https://rotemewan.weebly.com/uploads/1/3/1/3/131380756/2701952.pdf
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/9806889.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pewebopufupe/78810495010.pdf
    • https://s3.amazonaws.com/juzowilipi/do_home_warranties_replace_ac_units.pdf
    • http://kuwitabetegipo.myartsonline.com/wuginibemopugida.pdf
    • http://xufolat.atwebpages.com/how_many_overnights_reduce_child_support.pdf
    • https://s3.amazonaws.com/rurosaveruk/89254849553.pdf
    • https://s3.amazonaws.com/xiwevitox/blip_and_blop_windows_10.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_off00011083.bin
361fe8f6fa2aae08b8023bc647f3659823a9339ac5b7c7bc64e50d2f3172e347		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11083 5620 bytes
font_01_sfnt_off000123ba.bin
1a4eb98550deaf570e9879ad301d1ebe3f541bdecd165c2fb63e63ba26f42625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123BA 10988 bytes

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