Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17211af9a0eea7c…

MALICIOUS

PDF

69.3 KB Created: 2021-05-04 08:37:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70bb911948f2fe095530cbf033a6d7ea SHA-1: 265e0ded9b7f59721e445dbeab417f157f5d346c SHA-256: c17211af9a0eea7c063075a027c5dbc2ac89bd273a6eb8f376f3e22d2fa6d472
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm designed to manipulate search engine rankings or redirect users to malicious content. The primary malicious URL identified is https://xezojetit.ru/strik, which is likely part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=how+do+i+reprogram+my+clicker+garage+door+opener
    • https://xewomilofapo.weebly.com/uploads/1/3/4/8/134878854/8585992.pdf
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/gowemoxabuvebix.pdf
    • https://lamalirigade.weebly.com/uploads/1/3/4/5/134595912/4432713.pdf
    • https://mukeremu.weebly.com/uploads/1/3/4/3/134316251/52c66fc60.pdf
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/7979fccbeec18c.pdf
    • https://tiguziriwisil.weebly.com/uploads/1/3/1/0/131071210/dituguwinoxakuvagut.pdf
    • https://goneduxif.weebly.com/uploads/1/3/0/9/130969586/647872.pdf
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/6891789.pdf
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/982f165c7.pdf
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/nuwalanazavubab.pdf
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/bisakawakinu.pdf
    • https://maselevajaf.weebly.com/uploads/1/3/1/3/131398143/1fb4b3a.pdf
    • https://zojolutavalo.weebly.com/uploads/1/3/5/3/135345328/ravipa-bexiremi-xikum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lejivugeleguwod/60355662515.pdf
    • https://uploads.strikinglycdn.com/files/972ad460-0f08-4de7-9a6a-fd2596887231/craftsman_16_electric_chain_saw.pdf
    • https://uploads.strikinglycdn.com/files/69b5cff3-03ab-490f-860d-ffb2ff9783bd/how_to_replace_kindle_fire_8_battery.pdf
    • https://uploads.strikinglycdn.com/files/2b79315e-362c-4b1d-9fa8-a334f3ad60d9/haier_ac_remote_app_for_android.pdf
    • https://s3.amazonaws.com/muvazi/vopomiku.pdf
    • https://uploads.strikinglycdn.com/files/9ca8ef08-2a07-40e7-8a59-321e2ff9cb42/22931554461.pdf
    • https://uploads.strikinglycdn.com/files/b3c8c2f0-4ff6-4cfa-8654-3f350cfbd237/bamanafetufamepojujoga.pdf
    • https://uploads.strikinglycdn.com/files/9daab525-1b92-4f40-97d3-dc7c4f6d6ecb/45862959936.pdf
    • https://s3.amazonaws.com/fikuvine/sufumosomirozukudasapu.pdf
    • https://s3.amazonaws.com/zoromexemuzid/subtracting_decimals_worksheet_year_4.pdf
    • https://uploads.strikinglycdn.com/files/dd341bb4-522b-4c70-b91f-d2f41dba87fc/micro_expressions_book.pdf
    • https://s3.amazonaws.com/wekibik/asphalt_8_hack_unlimited_money_apk.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_off0000d246.bin
e80980a4a2ff1c4eedffb31ea36acbf4151fbed57936c4f3724f938441161f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD246 5432 bytes
font_01_sfnt_off0000e4ca.bin
e1e3a76fd0a12d480b3bfe00bd686e6ac04f36bfe80a2ba06c669bced7f24438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 10192 bytes

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