Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a00c173974937d2…

MALICIOUS

PDF

72.5 KB Created: 2021-01-24 23:06:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4d0fcfe7958671645ce3d618435f6795 SHA-1: 72683935fc55b41579b5d604ca876e6040280762 SHA-256: 7a00c173974937d2de6827cbd6253bb1c83096b1054b651b637ac797102ab63b
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and disposable hosting, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to a 'network protocol error'. The presence of numerous URLs pointing to potentially malicious sites strongly supports the classification as a malicious redirector and link farm.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=network+protocol+error+mac In PDF document text
    • http://soluzixod.66ghz.com/nisisajipojeluvo.pdfIn PDF document text
    • http://obschee.xyz/26539713656s6uo9.pdfIn PDF document text
    • https://bireguvax.weebly.com/uploads/1/3/0/7/130775683/vizujoweme.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/210926.pdfIn PDF document text
    • https://vataripisak.weebly.com/uploads/1/3/4/6/134600115/bexefuropapisot.pdfIn PDF document text
    • https://cdn.sqhk.co/rijunawep/HgfjbDz/mirror_sculpture_garden_minneapolis.pdfIn PDF document text
    • http://bifugejif.22web.org/solving_radical_equations_worksheet_with_answers.pdfIn PDF document text
    • https://nelixifejesuvol.weebly.com/uploads/1/3/1/4/131406681/8797843.pdfIn PDF document text
    • http://petrol-v-pol-price.site/stickman_revenge_2_modaxwd4.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/lorubelelizi.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/jcjiX3w/ginumiwodojakinasegeja.pdfIn PDF document text
    • https://faxezufag.weebly.com/uploads/1/3/0/8/130874059/3383451.pdfIn PDF document text
    • http://im-marceting.site/60500394791oana0.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/migivewuwe/tobopigugubavon.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/ziranunumonebeve.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/sulamufagu.pdfIn PDF document text
    • http://zafovitunopejus.epizy.com/molujisabodoxamakime.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/glucocorticoid_induced_osteoporosis_guidelines_2018.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5028 bytes
SHA-256: d7df420881fadbe2e65b30a9488012bf5bcc36ecca35e4522fba182030467f80
font_01_sfnt_off0000f09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09E 10700 bytes
SHA-256: dcbbf8f49ac7b9c763db2976e1f155a5e39c92ca5eb8153cd33fcaf6551b0763

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