Malicious PDF — malware analysis report

Static analysis result for SHA-256 58022bc01e81f52b…

MALICIOUS

PDF

75.3 KB Created: 2021-06-01 12:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b00fcbc1cfb98e6ef8175ef9e4d262dd SHA-1: 7583984fb81fe2f912788602010d8eef47c384a3 SHA-256: 58022bc01e81f52bedff1a29dae4af898f4dd5a3fa573d13894962e99e0b783c
194 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document contains a link farm with numerous external URIs, one of which is `https://allytemp.ru/pbw?utm_term=outstanding+balance+confirmation+letter+format`, suggesting a phishing or credential harvesting attempt. The presence of a fake invoice lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://allytemp.ru/pbw?utm_term=outstanding+balance+confirmation+letter+format PDF link annotation
    • https://mufuxavezefajox.weebly.com/uploads/1/3/4/4/134497947/sijakimil-jujaxexe-toxupeduxolif-ziwaworemutiz.pdfIn PDF document text
    • https://verafilutawus.weebly.com/uploads/1/3/4/5/134597792/9532146.pdfIn PDF document text
    • https://japewilipo.weebly.com/uploads/1/3/4/4/134471591/sunadetarud.pdfIn PDF document text
    • https://tiputanamadavok.weebly.com/uploads/1/3/5/3/135314880/5335185.pdfIn PDF document text
    • https://tanuroxej.weebly.com/uploads/1/3/4/1/134131309/9661919.pdfIn PDF document text
    • https://rapusixub.weebly.com/uploads/1/3/4/6/134631860/rodanuwi-bipoxeliwer-ninelinazo-panap.pdfIn PDF document text
    • https://sixabizutobago.weebly.com/uploads/1/3/4/6/134613494/190905.pdfIn PDF document text
    • https://kitogabizog.weebly.com/uploads/1/3/6/0/136053612/puwiguz.pdfIn PDF document text
    • https://nulokoset.weebly.com/uploads/1/3/4/4/134447361/tebufaxikemesug-nawulenin.pdfIn PDF document text
    • https://diruwogedow.weebly.com/uploads/1/3/1/3/131382439/5112823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xojifot.pbworks.com/f/pudivi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c00be90-7c47-48f5-8078-7309934d0048/43436665564.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144426168/mazavowem.pdfIn PDF document text
    • http://zepupifob.pbworks.com/w/file/fetch/144426084/how_to_find_average_speed_in_physics.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/w/file/fetch/144441054/73267394064.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a03ca3-0c1d-4ada-9fe6-749892a70d56/82369898212.pdfIn PDF document text
    • http://viluxese.pbworks.com/f/lutekavalogalafapudi.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423594/65741816773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b914f53e-51ab-473e-be5a-eda7a58f5756/10271046157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/112f50c5-87e4-4f37-b606-09787ffdf39e/zijetetaxunezot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1c7c4f-bfcc-412c-86c1-b2953b625971/fosekesofalaruzazeto.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/w/file/fetch/144444720/the_traders_blueprint_book.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/what_is_an_example_of_combined_variation.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_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 5508 bytes
SHA-256: 0e88b418a7b8e140eae6499a4087d1a04fdaffb21d75e9c895cba35b69214805
font_01_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 10468 bytes
SHA-256: c05d38c4442dca8708b3c50b4147fb03dfe407ea736bb4d3c9058cfa61522297

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