Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16debab4f91c07d…

MALICIOUS

PDF

73.9 KB Created: 2021-02-21 19:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a6478721e85a99e58ea3f44c7c3a4dc3 SHA-1: 3b6c91d7e420da82ab8c68b87c9ce4580dbc418a SHA-256: f16debab4f91c07d8fcd55bd65c08668687630e12d1e7b0dc6f2f08c5f9908ab
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though obfuscated, appears to be a lure related to book downloads, likely leading to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://bologen.ru/wb?keyword=heroes%20of%20olympus%20book%202%20pdf%20google%20docs PDF link annotation
    • http://myfavoritesun.xyz/pepime4kuoc.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/4Mj9Gje/kickstarter_board_games_july_2020.pdfIn PDF document text
    • http://fullstacket.online/udemy_certificate_sample2yw5j.pdfIn PDF document text
    • https://nobaloledajasom.weebly.com/uploads/1/3/2/6/132681012/855371.pdfIn PDF document text
    • https://cdn.sqhk.co/ripigopes/jajc9iA/49274542440.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/j2qjbja/bholes_color_hole_3d.pdfIn PDF document text
    • http://stopro.store/16457463453t4av.pdfIn PDF document text
    • http://smirno.life/25776030949ht2as.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/hdjgoBj/dhoom_dhadaka_star_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/bulixanejad/ePjbwia/full_steam_espresso.pdfIn PDF document text
    • https://cdn.sqhk.co/torixugajo/hiijdjh/bumodifakerepume.pdfIn PDF document text
    • http://netzamka.ru/vituwa7wjdh.pdfIn PDF document text
    • http://oyuncuxx.com/21087388609ryq2j.pdfIn PDF document text
    • https://koditagonuxu.weebly.com/uploads/1/3/5/3/135339835/6217223.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/njajhUn/christmas_around_the_world_fact_file.pdfIn PDF document text
    • http://store50off.info/zuvevewuk6lrs7.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
    • https://s3.amazonaws.com/penale/fupigulesirof.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/time_to_contemplate_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/how_to_calculate_net_profit_after_tax_from_balance_sheet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 5312 bytes
SHA-256: 92921e97a7f058ebc4a182e4ad23e0a6a33a0570f5b794bac366a3ab904c2ee1
font_01_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 11180 bytes
SHA-256: bc78a9f69ea0c34421aaa04528ed8eea89662220589c8ee729485af2d65409db
font_02_sfnt_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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