Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf77bd1565f1a8de…

MALICIOUS

PDF

98.2 KB Created: 2021-03-18 21:35:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 384a0abb75cbe71d65db2669ddc8577d SHA-1: 8ac15d9d2385343a024220a5d26473461333c817 SHA-256: bf77bd1565f1a8dec946e4fffc763f4123db0ea4a09a02532815ed41789f87ef
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many of which are SEO-themed, suggesting a link farm or redirection scheme. The embedded URLs point to various domains, including fokemale.ru and weebly.com, likely serving as lures for malicious content or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://fokemale.ru/award?keyword=alternative+dispute+resolution+book+pdf+philippines
    • https://wabirigiraziw.weebly.com/uploads/1/3/6/0/136017191/3462935.pdf
    • https://cdn.sqhk.co/jawefujivi/Jifhjib/kujin.pdf
    • https://cdn.sqhk.co/limizolaxa/Yjdiigd/lewixalebunukojakixeg.pdf
    • https://cdn.sqhk.co/jisujesox/hhg0dsE/special_forces_group_2_hack_mod_apk_download.pdf
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/bbe84b09915f9bb.pdf
    • https://cdn.sqhk.co/nowavutu/Ejbjgcx/zombie_is_coming_v1._0._unitypackage._com.pdf
    • https://static.s123-cdn-static.com/uploads/4455883/normal_5fc9b01b50a44.pdf
    • https://cdn.sqhk.co/voxedijudibo/fhcBUda/janug.pdf
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/2793663.pdf
    • https://cdn-cms.f-static.net/uploads/4449410/normal_5fdaec25b539e.pdf
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/potebek.pdf
    • https://cdn.sqhk.co/vivepovugeli/ifidYdZ/cheap_birthday_cake_makers_near_me.pdf
    • https://tuvepovuno.weebly.com/uploads/1/3/3/9/133997374/6f8158d4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a219830d-c565-40c9-b3ef-a9a32e19fd1b/jimitopekidibogajiz.pdf
    • https://s3.amazonaws.com/risisipajole/bevojex.pdf
    • https://s3.amazonaws.com/debamijizozexo/55900449190.pdf
    • https://uploads.strikinglycdn.com/files/9891d083-1624-415d-a951-f87a18bb2476/garmin_zumo_660_update_problems.pdf
    • https://s3.amazonaws.com/vogubivajavofu/19577413102.pdf
    • https://uploads.strikinglycdn.com/files/bab55c93-11ac-47f8-9842-406236c3eeaa/how_to_cross_the_river_styx.pdf
    • https://uploads.strikinglycdn.com/files/efe6bdc5-853c-4a0a-9c95-2b89ce6a7344/metal_gear_solid_4_big_boss_voice_actor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b35.bin
5e348212813e9b303bc03b8caa8cef5cc2f1ea1527fdcb501770e09676e655ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 5380 bytes
font_01_sfnt_off00015d7b.bin
c973f86f86a5f8b855a10e3cdbf2b26604cbf0e06324dd933bc9fffd09686988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7B 10612 bytes

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