Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7472a83d040b36…

MALICIOUS

PDF

94.2 KB Created: 2021-03-16 00:44:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa8a93241a65d92738527cbc46d03b64 SHA-1: 97e4ca63f758f79d5ce851aadda91f41c0c95457 SHA-256: 9c7472a83d040b3636385a06386aa0b28b6ab748fda083e82035d7266d4cc67a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, identified as a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. The primary attack pattern involves redirecting users through a series of links, potentially to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=tera+vshm+guide
    • https://dugeditukuvil.weebly.com/uploads/1/3/4/7/134723955/5839315.pdf
    • https://xemalijojododud.weebly.com/uploads/1/3/0/9/130969235/baxujinadol.pdf
    • http://jixagosetevef.22web.org/7881274093.pdf
    • http://nekemepomisares.22web.org/friends_song_pagalworld._io.pdf
    • https://cdn-cms.f-static.net/uploads/4415937/normal_6020fa6936570.pdf
    • http://ledifosoxeli.22web.org/vefazutela.pdf
    • https://ditixalopu.weebly.com/uploads/1/3/1/4/131410538/xukoli_gareravuk.pdf
    • https://cdn-cms.f-static.net/uploads/4470542/normal_5fe736206c839.pdf
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/573658.pdf
    • https://cdn-cms.f-static.net/uploads/4449399/normal_600edb6ab4cde.pdf
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/7799716.pdf
    • http://bimufufedo.22web.org/jurnal_pengertian_titrasi_kompleksometri.pdf
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fe615dac98e1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitidadufetenu/nemufigi.pdf
    • http://dizaxobaka.rf.gd/kingdom_of_the_wicked_download.pdf
    • https://s3.amazonaws.com/geradi/swimming_pool_maintenance_guide_for_dummies.pdf
    • https://e6c529cc-411f-4195-b5ea-7b5fd081490a.filesusr.com/ugd/b7ab08_1446d28f169746bca0763328a6e7244d.pdf?index=true
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_79a66ac0d03e439984cb36d0c8e35554.pdf?index=true
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_bb1626509bda4223abe0dabb6ba87e18.pdf?index=true
    • https://s3.amazonaws.com/kubafezin/ladagunataxuzobiweperev.pdf
    • https://8319d365-0190-44ee-b2f3-e76f6fd230eb.filesusr.com/ugd/112488_18b627d48c914876b293c7aa36bb82bc.pdf?index=true
    • https://s3.amazonaws.com/zifozujiwi/thermodynamic_cycles_questions_and_answers.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_off00013349.bin
67050c3595513820c0fb3c9c8ff0136239a1edb58b9bde75196f73631e7d4927		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13349 5216 bytes
font_01_sfnt_off000144e3.bin
b4b53fc8ae3288d5b29a645f1961a7df37bace67455e5fb45898002a39047cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144E3 11524 bytes

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