Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e7c4371c70ddc5…

MALICIOUS

PDF

56.8 KB Created: 2021-02-26 09:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1132c9d14652d05a7ee73e9c03b3a2c2 SHA-1: a812eb334bd7de8d6ec8e557dea3cc507d032190 SHA-256: a3e7c4371c70ddc5dbbe871649565fb914e148a44d45802234ce07a0d14fd018
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, including one to 'leonvi.ru' which is flagged as a PDF URI. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a link farm or phishing lure, disguised as a 'Starbucks employee handbook 2021'. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8022

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=starbucks+employee+handbook+2021 PDF link annotation
    • https://cdn.sqhk.co/jujejorule/Ohcicif/1123330900.pdfIn PDF document text
    • https://taxezuwijukiwum.weebly.com/uploads/1/3/1/6/131606901/89abda.pdfIn PDF document text
    • https://cdn.sqhk.co/fujesepulo/5jcc48v/gojekaje.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/geYm1Qf/nogazepulepisixog.pdfIn PDF document text
    • https://belukuxar.weebly.com/uploads/1/3/5/3/135312366/3857385.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/684762a.pdfIn PDF document text
    • https://xovisifolato.weebly.com/uploads/1/3/0/8/130814526/kovafovegipav_mexuviwibopomi_mapuroparivogoj.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/Xgejajb/19660243926.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopajika.epizy.com/iphone_photo_effects_for_android.pdfIn PDF document text
    • http://manuzuwefegovev.epizy.com/xodegalusiwelinufu.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/vubux.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/sea_of_fallen_stars.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/kikofipulisegeveni.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/64374837675.pdfIn PDF document text
    • http://savejanaxejov.rf.gd/strongs_concordance_2199.pdfIn PDF document text
    • http://jaxarafepemu.epizy.com/gimutafu.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32A 5880 bytes
SHA-256: aaebc1814efdd823de8bec463cea44708e444d6b55bbe1349a50049bed34635e

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