Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff25d96d59387184…

MALICIOUS

PDF

77.7 KB Created: 2021-03-11 00:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5d8d5b0e26b336fae233568762a67227 SHA-1: e9191974f20274fe549c827f68e67b80039e3021 SHA-256: ff25d96d593871843b97c298e75ea188308571e9c43c124f85e52ee9312ab99f
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple external URLs are embedded within the PDF, suggesting an attempt to redirect users to potentially malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a common tactic for distributing phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/award?keyword=sistemul+renina+angiotensina+aldosterona+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382405/normal_603a698b28314.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/vizekowe.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/jhjhjd9/7863176429.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/17159059.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_60267be05ad50.pdfIn PDF document text
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/saranidonagox_xesabo_tunako_gokafidugibo.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/kuwulut.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hdjjd9o/31991079949.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/bghW6kT/plants_vs_zombie_free_online_game_full_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449395/normal_6001db406a11e.pdfIn PDF document text
    • https://cdn.sqhk.co/gigatakel/XhaK4XU/4755035754.pdfIn PDF document text
    • http://foxudenop.iblogger.org/jixabafinuduxevobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_6002210de90c0.pdfIn PDF document text
    • http://tonevagewalilu.medianewsonline.com/82711712218.pdfIn PDF document text
    • https://sevakozo.weebly.com/uploads/1/3/4/6/134677934/ridobefiwaw_loxitowag.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/Bciibji/50636006758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_6029b361ef2dd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fepujevuzal.rf.gd/nature_man_and_woman_free_download.pdfIn PDF document text
    • http://fugovolit.rf.gd/mawumux.pdfIn PDF document text
    • http://josotemasafu.rf.gd/37457739191.pdfIn PDF document text
    • http://risogida.rf.gd/judo_gi_sizes_guide.pdfIn PDF document text
    • http://nadadeze.epizy.com/rokuv.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_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 5464 bytes
SHA-256: 9982a6e6dcafc682909790cdc935a81f530b52d1672b12a35b2b6383b5a8f5f4
font_01_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 11632 bytes
SHA-256: 8770cb60d0f88f156df2e57961a40d5912a21da767ca09ef169e3711f2492b95

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