Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4487fba2570509…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 20:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8f2c980368e871ec55f1e62a7b21816c SHA-1: 780b99097316de27fabd58af4baebc43617f7bb3 SHA-256: 6c4487fba25705096496a92f81ab2a8984ccea0bec62f8e5a904c3c56275e20a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or scam attempt. The primary malicious URL, https://mezovuduw.ru/strik, is disguised as a search result for pellet stoves. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=what+is+the+best+pellet+stove+out+there PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374951/normal_5fdeaf5c6066e.pdfIn PDF document text
    • http://nijaxubazaziw.mypressonline.com/gelivesofijemob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_603f1ab691808.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/kipitegovedamoki.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/29313510662.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/koripugilenavezopomabuwe.pdfIn PDF document text
    • http://ejqy.com/what_is_the_geometry_of_h2opmhqi.pdfIn PDF document text
    • http://ligugiban.scienceontheweb.net/faxakesegisidi.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/simijogukodu.pdfIn PDF document text
    • http://dapujabowigu.sportsontheweb.net/classroom_rules_for_kindergarten_with_pictures.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/present_past_future_tense_words_list.pdfIn PDF document text
    • http://predouche.xyz/gefewokovobunolijivijunusvq7e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_566ecbdc6be34b2484837fb03f0ba16d.pdf?index=trueIn PDF document text
    • http://rodedewezijore.atwebpages.com/bixavatapelu.pdfIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_8d5d3e1275004dc085552347af759a5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/can_i_print_from_iphone_to_hp_printer.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/raynor_garage_door_opener_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/15760425029.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/how_to_change_the_drive_belt_on_my_husqvarna_riding_mower.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/fatiwagogefifuwiz.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_87f8d242f5644b9b842a6f74aabfe3d1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA25 4896 bytes
SHA-256: cf59fe9b507182af200f4ff2f20a92b9d1c02eb5121bbbb40aea3485bfd8d007
font_01_sfnt_off0000faeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 10528 bytes
SHA-256: 399224e01bf1e74c3991261f6ae4c8d8b1cc511459f12da414d18f27ad32b15e
font_02_sfnt_off00011eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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