Malicious PDF — malware analysis report

Static analysis result for SHA-256 993afe51a238cb10…

MALICIOUS

PDF

76.5 KB Created: 2021-03-23 00:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bf53d2925418c71e03079c4acb512c8e SHA-1: 09405d0b11e0e0ad69c8d1cec3f12bfd400a0dcc SHA-256: 993afe51a238cb10450236c24848dfb0e523978070b1b4ede499dbf04cf39cca
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host multiple PDF files. One of the primary external URIs points to a suspicious domain, suggesting a phishing or malware distribution attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://lozipotod.ru/aws?utm_term=how+to+cook+rice+in+tupperware+mini+rice+cooker PDF link annotation
    • https://wofudanizosaxig.weebly.com/uploads/1/3/1/6/131637209/4b859a.pdfIn PDF document text
    • https://funosojo.weebly.com/uploads/1/3/5/3/135336125/3700539.pdfIn PDF document text
    • https://fafemuwupid.weebly.com/uploads/1/3/4/3/134368635/dupap_buzatasubedox_barego_guvemaluziduzu.pdfIn PDF document text
    • https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/1813880.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/6eb8d.pdfIn PDF document text
    • https://wajiresejepo.weebly.com/uploads/1/3/0/7/130774962/4511a314394bd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f1158f2-e44e-4cac-991a-806210d1dc3e.filesusr.com/ugd/e4a8e1_9cf46c4f6e824b53999e403dbc0ef26b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/dixedoju.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/dragon_age_inquisition_game_guide_walkthrough.pdfIn PDF document text
    • http://giwokekurodi.rf.gd/werewolf_dnd_5e_race.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/complete_comptia_a_guide_to_it_hardware_and_software_7th_edition_download.pdfIn PDF document text
    • http://fosikim.epizy.com/76444547673.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/34273388631.pdfIn PDF document text
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_edcf74d957ee4549a64e1f3f0035c498.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/16180849264.pdfIn PDF document text
    • https://e26dc784-fa46-4601-9f6d-57686faaf216.filesusr.com/ugd/c66525_231d57da3b854d499f2d5e435e14e915.pdf?index=trueIn PDF document text
    • http://rovuwuruw.epizy.com/cursive_m_and_n_worksheet.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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 4984 bytes
SHA-256: 5918fb1dafc76041188c7c648f73d181317c4f022a722691302aebaa69388201
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10288 bytes
SHA-256: 6ed845cd2a467e7e76d2c06f6e4dc463f049742d9b57e28bd701ea69e8ee7e42

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