Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d4beec394d4b81…

MALICIOUS

PDF

69.7 KB Created: 2021-03-08 20:52:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: abdd9630eb288b3ace522b42423beaa5 SHA-1: 278aa98db11581ecf0dc2c5c1743111337563d31 SHA-256: 09d4beec394d4b81ff97e1983f14a47993fd846525248de54b3222f99b9fe19d
126 Risk Score

Malware Insights

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

The PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. It contains numerous external URIs, including a primary link to 'jottigo.ru', suggesting it is designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/strik?utm_term=nasm+6th+edition+textbook+pdf+free PDF link annotation
    • https://tenipimip.weebly.com/uploads/1/3/4/0/134042327/doradoxuduju.pdfIn PDF document text
    • http://sesizuxewewax.mygamesonline.org/is_it_illegal_to_not_renew_a_lease.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/what_are_all_the_animals_that_hibernate.pdfIn PDF document text
    • https://nugibunexediga.weebly.com/uploads/1/3/0/7/130740514/patipidedulokem.pdfIn PDF document text
    • https://wifojulov.weebly.com/uploads/1/3/1/4/131438113/8f42744cb0632d5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/vizio_sound_bar_stuck_in_pairing_mode.pdfIn PDF document text
    • http://bisubop.epizy.com/96357808810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd44e756-40b2-4498-a6a2-01d8cb510baf/wobuxagadetates.pdfIn PDF document text
    • http://doxenobuso.epizy.com/1477991010.pdfIn PDF document text
    • http://jetubomubiko.epizy.com/67626127355.pdfIn PDF document text
    • http://pozobigeva.rf.gd/88752127784.pdfIn PDF document text
    • http://nudegew.rf.gd/vivifejubujewatuvozi.pdfIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_67d90b2cc6b743099607357ce6e892d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9150e311-f41a-43d6-8189-b0974b36862d/what_are_the_codes_for_onn_tv.pdfIn PDF document text
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_93239861180947ef9139a1c6e3dc9ce5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b37eec-3e88-4fb3-872b-5a085ffdd434/kuxikivadefujased.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a509d9ff-c70d-4b47-8756-312a8d4de7c1/juter.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 5644 bytes
SHA-256: 13c37b27e25b32b81afd5c108d24e0b816502e57928b4dcdbd28709c3b6c1be8
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 10332 bytes
SHA-256: c25aee73811ccc75dd961a208d52e5e448a935be52c553a35c43e452f4376ee6

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