Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b56554a39aff52f…

MALICIOUS

PDF

75.9 KB Created: 2021-04-06 04:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c29e7ae3f7650a04fa0c2bfeaf2c15df SHA-1: 187c5a6271a96d7daa4d5c8e5bd23f50ba8f7952 SHA-256: 1b56554a39aff52f89c802137898e9430ee5963f17df1f53a76ae8fa42807182
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=2020+master+electrician+exam+questions+and+answers+pdf PDF link annotation
    • http://copyright-securityx.com/breadman_ultimate_spare_parts41fyb.pdfIn PDF document text
    • https://lokaxanexu.weebly.com/uploads/1/3/4/6/134638146/4959104.pdfIn PDF document text
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/51c6d.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/jahiagj/samotigopoluwe.pdfIn PDF document text
    • http://tusiteguluvora.getenjoyment.net/88647550554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448103/normal_606ba411f23c0.pdfIn PDF document text
    • https://cdn.sqhk.co/pefisemise/jajefHy/16105224717.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/rowenta_steamer_handheld.pdfIn PDF document text
    • https://jovonawokemurif.weebly.com/uploads/1/3/4/6/134678447/jusifinotobigofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_601b7d93a0c94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450636/normal_60248bab7d189.pdfIn PDF document text
    • http://bottlechainworld.com/jiwegaruzadudubipudawaxidytc0s.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/aWicJic/lurixopunip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pazepoxi.atwebpages.com/accra_map.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/29142913809.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/79782513830.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/fixabinoxeditinal.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_off0000e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE932 5764 bytes
SHA-256: c934b73cdc2979fb911710f26cdeb939579b48dedc557bbb374802db4d9b865b
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 11040 bytes
SHA-256: 43ce5c3b2620092df8ccf96cd4877dfd02979bb8b3329671ccb92a01b44c4fc8