Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5446bf3f308b40…

MALICIOUS

PDF

81.6 KB Created: 2021-02-28 04:06:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9861865879ad3562f7f4d62d421ec7d6 SHA-1: f486a0b3d84a6f76659286a97cdcaae2a9caef8c SHA-256: aa5446bf3f308b40a3603d9d57fb9cfa336acdc2f7fef19d7a4ebbe475a8a449
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, suggesting it functions as a lure to external malicious websites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a pattern of using link farms on disposable hosting to obscure the true destination. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

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 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://vilenefex.ru/strik?utm_term=analise+literaria+do+livro+mem%25C3%25B3rias+p%25C3%25B3stumas+de+br%25C3%25A1s+cubas PDF link annotation
    • http://sputnews.com/free_classical_christmas_piano_sheet_musiclhd5n.pdfIn PDF document text
    • http://limons.space/beautiful_star_of_bethlehem_sheet_musicirr55.pdfIn PDF document text
    • http://rfs.team/1290021943lqwoy.pdfIn PDF document text
    • http://magnitoli-2ekran.site/kononofigavopijamoketijubba3u.pdfIn PDF document text
    • https://xujoxufopugapes.weebly.com/uploads/1/3/1/3/131380539/6304694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_5fd9ab8826360.pdfIn PDF document text
    • http://itdiscounts.info/bomadezeuh39y.pdfIn PDF document text
    • http://leree6.club/integers_opposites_absolute_value_worksheet_answersb9s42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_600a407726595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_601779f044a21.pdfIn PDF document text
    • http://gnatural.space/best_rechargeable_battery_charger_2019_australiaxm6uv.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/9894336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5fed45075971e.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/1mobile_market_apk_download_for_iphone9o931.pdfIn PDF document text
    • https://norabemomo.weebly.com/uploads/1/3/0/9/130969424/sojivutarome.pdfIn PDF document text
    • http://tixshopclub.fun/67042628656bwtgy.pdfIn PDF document text
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/2e790646e2c997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5660 bytes
SHA-256: 5246e82334cf5cea22bb303cb152462c45bec40b26bb7045fe7776a103973f91
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 12436 bytes
SHA-256: b9a4d641e28ae574bad0f31edacb11eb8a60180c04a62e8af3713d3ceb6f4182
font_02_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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