Malicious PDF — malware analysis report

Static analysis result for SHA-256 405498e1a868ae81…

MALICIOUS

PDF

75.3 KB Created: 2021-03-14 01:04:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 889599be9315b1d7683bd716f588f0c8 SHA-1: a6bc5b4d729d3c4e19185336c80e0f0116a8cfbe SHA-256: 405498e1a868ae819d6a2078a84acd205300e0bc39b87ed646d8161f6fc1d4d0
142 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, presenting multiple external URIs, with one prominent URL being `https://dugedepap.ru/123?utm_term=petty+cash+book+format+pdf`. The document body, though heavily obfuscated, contains keywords related to invoices and download lures, suggesting a social engineering attempt to trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/123?utm_term=petty+cash+book+format+pdf PDF link annotation
    • https://cdn.sqhk.co/jiluputumusi/iboNiiN/liwofaj.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/iaqigGq/nixowulorizagukuvupemuma.pdfIn PDF document text
    • https://milatesedupodil.weebly.com/uploads/1/3/1/4/131437919/ragolamadopomolowa.pdfIn PDF document text
    • http://zagejudivavi.sportsontheweb.net/palef.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/ajhcTii/vugawokudulos.pdfIn PDF document text
    • https://cdn.sqhk.co/dekaroku/TgeoLQr/todotebapogagobivu.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/PlLicN9/animus_harbinger_1._1._4_mod_apk.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/89941308774.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/tajefonafegiwusaxajumu.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/zuzubagum-semofulupulak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/wasag.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/tukorotowididi.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/zizuvozezibupafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2fbe0c8-537f-4cca-ab84-a1972dcddc19/85599819314.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/notatezezaxotezogapapix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117ba06d-0b2a-443f-ba81-a4f959a2de47/hills_c_d_dog_food_canned.pdfIn PDF document text
    • http://josodajudiwabo.epizy.com/pumaj.pdfIn PDF document text
    • http://supegawezokex.epizy.com/pawodakurifemunobaloga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb18f0f-5c04-4859-b637-909c382cee68/rajatexuwaxax.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/foximobenapibelizagotiluk.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_off0000e753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE753 5672 bytes
SHA-256: 884886df210207f1054d560c1384d21cfe8b55b2f45dce412b9024a9e6963676
font_01_sfnt_off0000fa76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA76 11124 bytes
SHA-256: 65bc5be5afa0d7ddf30a11fc32e9375b44516e88a6060758cffa7e74d8e40169

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