Malicious PDF — malware analysis report

Static analysis result for SHA-256 81511282fdeb624d…

MALICIOUS

PDF

73.9 KB Created: 2021-03-22 05:19:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 12a259a61a3857b5c04b5333f04cc615 SHA-1: b99a5669c481a8b6e5a53499cf65bc80e18064c7 SHA-256: 81511282fdeb624d59772245b9ce503e5fee406e07bc802e165856ca989a9ef9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with at least one pointing to a disposable hosting domain and utilizing UTM parameters, suggesting a phishing or link-farming attempt. The document body, though heavily obfuscated, contains references to financial topics and application metadata, further supporting a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=how+to+report+imputed+interest+expense PDF link annotation
    • https://cdn.sqhk.co/gujowaxexag/eihb0gh/gitukabosuwegixugavofirol.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/heYqsjg/wallpapers_for_gamers_2020.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/lokig.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/53950a5434e813f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_5fc7b178ebd90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_60255457e5212.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fd23fe1a101f.pdfIn PDF document text
    • https://cdn.sqhk.co/kazaluxi/bhjtd4y/48844347614.pdfIn PDF document text
    • https://cdn.sqhk.co/gulijolane/m7YifsA/dotosukawitolutogu.pdfIn PDF document text
    • https://burazukukoxuvi.weebly.com/uploads/1/3/4/0/134096138/mezevumevew_xokagotaf_lusibijexepuru_fizenoxumituse.pdfIn PDF document text
    • https://salizobujexi.weebly.com/uploads/1/3/5/3/135325558/kugomimozepixu_bemop_suwixiwomil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_603d2de4aac51.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mopuxogimofuzu.rf.gd/spanish_grammar_for_beginners_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/how_much_does_a_software_engineer_earn_in_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815088ed-3d12-48bb-b8f7-e4ca13a94bfc/used_hobart_meat_slicer_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/nolarifaforuxop/635677001.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/62668472780.pdfIn PDF document text
    • http://rujolur.rf.gd/67071560135.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/anaconda_movie_full_hd_720p_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca99c2a-0045-44b0-b00b-0f4cd919da74/fear_and_loathing_on_the_campaign_trail_summary.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_off0000e683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE683 4984 bytes
SHA-256: 174ee9687e39076a89325aafb1b11779a523fcf36112e48b7cac2d7d0a22b834
font_01_sfnt_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 10180 bytes
SHA-256: 4070af498c15e8f0895630ac1639418951bc7e1eb27de2e7426e7891b616d7a5

Open this report in the interactive analyzer, or submit your own file for analysis.