Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f2112d320ed96b…

MALICIOUS

PDF

121.3 KB Created: 2020-12-26 09:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 8078cc7024a89193f51b1fadc947d2da SHA-1: 074c10d7bcf9afab726a6a041f00363def08a942 SHA-256: 92f2112d320ed96b8a40ba1c17cbdbafe6cca6e8d35695eb1943b3f7933dad9a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The presence of numerous external links suggests it may be used to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://trafficel.ru/strik?utm_term=broken+heart+font+free+download PDF link annotation
    • https://gunulavosaki.weebly.com/uploads/1/3/4/3/134374607/vumufebizizufa.pdfIn PDF document text
    • https://wexipemeb.weebly.com/uploads/1/3/4/8/134860193/e0a2e11e98.pdfIn PDF document text
    • https://munuvatatopa.weebly.com/uploads/1/3/4/6/134686277/kisama_lapibari_minulazugafuli_fozuz.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/3gicgja/78462981331.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/3112005.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/jowidafebo.pdfIn PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/bixufudufoxa_sonefasi.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuzasana/ich8jjh/hidden_mystery_games_y8.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/tarazedufoxipomaz.pdfIn PDF document text
    • https://vefoduga.weebly.com/uploads/1/3/5/3/135302220/80b18d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.orgThisIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca2a3197-7bff-4412-b3d6-9ada0bf29ea3/vuwizesemojexetodesaluw.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/minecraft_waystone_mod_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/keystone_credit_recovery_american_history_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734a4271-7162-4a72-bde7-9f3dc3cf3906/degixopaxesemeludedopi.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
    • http://scripts.sil.org/In PDF document text
    • http://scripts.sil.org/OFLAbyssinicaIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 5024 bytes
SHA-256: 01a2573dd77bfa0020ac3f0ff392ca01a84ffff317005c1d813aafcb57226d89
font_02_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 26912 bytes
SHA-256: b282ed64983bf0f6874570528f0cb224d2fa4437a1fb31f5f813a698053bd197
font_03_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 21532 bytes
SHA-256: 8dfb2c4df79ca0498a93367709831b7bf401c5d962e1c8d39df823aa019ef52a
font_04_sfnt_off0001701e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701E 21856 bytes
SHA-256: f877da6faf43853ffb1a39404c3988c149c350c426a55bc84ee4047d64d61401
font_05_sfnt_off0001b0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0F3 16564 bytes
SHA-256: 50082a4d88a3e36b52504868d03a795d03c7e02b6a743a3293b9472b51e4d883