Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eabef4730d8b85…

MALICIOUS

PDF

54.9 KB Created: 2021-02-21 06:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35d22c6981d528ccd323904b2e6db9c3 SHA-1: 8d98f8d09702d42499a0e99b2f1cf84e6408ac41 SHA-256: 87eabef4730d8b8583ef39bf7096d118cb52e16ad7ff504a03507d816fd8b3fe
212 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a phishing or malware distribution attempt. The embedded URLs, such as https://yafferge.ru/strik?utm_term=los+generales+de+dios+audiolibro, are likely used to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9677

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=los+generales+de+dios+audiolibro
    • https://cdn.sqhk.co/kupuvikadob/haBbugj/h_and_m_landing.pdf
    • https://cdn.sqhk.co/tukawezezo/ijgegc1/jobonupegupined.pdf
    • https://lirodenagegoket.weebly.com/uploads/1/3/1/4/131437677/6252243.pdf
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/xekukapabab_diburoxoz_xumagofonesori.pdf
    • https://cdn.sqhk.co/wuxobilan/kcichfF/screen_recorder_app_mac.pdf
    • https://rubopawine.weebly.com/uploads/1/3/1/0/131070645/271404.pdf
    • https://cdn-cms.f-static.net/uploads/4370533/normal_6016254dd550a.pdf
    • https://cdn-cms.f-static.net/uploads/4388428/normal_5fe72282dc4e5.pdf
    • https://cdn.sqhk.co/xevowuto/qgeghZA/apple_tv_4k_playstation_controller.pdf
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/xakerilab.pdf
    • https://cdn.sqhk.co/gutejalajige/gmdvghb/codigo_procesal_penal_guatemala_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tewufadab.epizy.com/acamprosate_dosage_forms.pdf
    • http://vazorilumi.epizy.com/acetylated_starch.pdf
    • https://s3.amazonaws.com/bodajaku/venorabagegufeti.pdf
    • http://wokepotaku.epizy.com/duwatijomedebir.pdf
    • https://s3.amazonaws.com/xefezesebusu/flight_landing_video_free.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccce.bin
95e68b6136d7b3ddb353c99c4b7780da21a4e3efb2d5796d1cbe280efee3bd4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCE 5072 bytes

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