Malicious PDF — malware analysis report

Static analysis result for SHA-256 a96431ea4f8eae34…

MALICIOUS

PDF

75.2 KB Created: 2021-03-18 06:44:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c954ff6c75c7a4207ae74b2bba4c50 SHA-1: 1e8fefbb03e24cdfb7a56a92fe0a78efe729d4b6 SHA-256: a96431ea4f8eae343253da4f070979f6095d066406e19890383c46fc3b36d46c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on S3 buckets, suggesting a link farm or SEO spamming operation. One of the primary URLs, 'https://fokemale.ru/strik?utm_term=how+to+fix+sound+on+vizio+sound+bar', is presented as a lure to fix a common technical issue. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=how+to+fix+sound+on+vizio+sound+bar
    • https://somokowu.weebly.com/uploads/1/3/1/3/131383604/47423.pdf
    • http://luxomozuk.mypressonline.com/14491007646.pdf
    • http://wudebakafepi.mypressonline.com/tan_application_form_49b.pdf
    • https://gutalekosipotix.weebly.com/uploads/1/3/4/3/134351461/d7989.pdf
    • http://tadenexibegujam.22web.org/what_order_does_the_white_queen_books_go_in.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sobaketemu/60988372281.pdf
    • https://s3.amazonaws.com/saziwijaxodav/kumagafegotuf.pdf
    • https://s3.amazonaws.com/dinilederu/rec_screen_recorder_apkpure.pdf
    • http://zudupaxub.myartsonline.com/37605842955.pdf
    • http://jozobudesurarab.onlinewebshop.net/duvebimotufojawuwobufe.pdf
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_de2498656ec64e2d9ab1229c343e58b1.pdf?index=true
    • https://s3.amazonaws.com/xifabilejilab/homecine_apk_2019.pdf
    • http://wolamavaxekaba.epizy.com/simple_interest_worksheet_for_class_8.pdf
    • https://s3.amazonaws.com/palikuvexake/mujunopur.pdf
    • https://s3.amazonaws.com/kegubinefuda/38381307655.pdf
    • https://s3.amazonaws.com/vavale/29883073040.pdf
    • https://s3.amazonaws.com/jidosatikim/bedemanunofuwerugera.pdf
    • https://s3.amazonaws.com/pafexegud/badger_500_garbage_disposal_specs.pdf
    • http://piloxezerepijaf.rf.gd/2019_ram_1500_slt_towing_capacity.pdf
    • https://s3.amazonaws.com/serogajugomiji/gisefunitotekiru.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_4a990e72c3d34738b28e1f6a41f34467.pdf?index=true
    • 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_off0000ea14.bin
779a425c9d526f5293ed7831535172f48890fe745df3eda103945a756d4a4cc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA14 5240 bytes
font_01_sfnt_off0000fc18.bin
361b7bc0bf331d95035cb33215c5409f02252ee48a83135531361247233529df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC18 10412 bytes

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