Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ff765b436e576c…

MALICIOUS

PDF

76.5 KB Created: 2021-04-03 02:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8a04181370ba42518790700784454dc4 SHA-1: 0814056f5e906b820bba7419528fb740283533b4 SHA-256: 62ff765b436e576ca62774fcf27a9dfddde8691ab765e30a7b16f030e5017737
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/award?keyword=english+test+for+kids+level+1+pdf PDF link annotation
    • https://fivaxozokudok.weebly.com/uploads/1/3/6/0/136049694/zifikexipetoxuxixin.pdfIn PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/46fafffeaea778.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/tegitaxutekel.pdfIn PDF document text
    • http://kefets.xyz/927981015079vv0r.pdfIn PDF document text
    • http://megatorg.ru/gimedarebaxrldl3.pdfIn PDF document text
    • https://cdn.sqhk.co/jigijobofofa/iemhaH4/54995896325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369779/normal_605685badbf06.pdfIn PDF document text
    • https://xuwudavalibabiv.weebly.com/uploads/1/3/4/3/134321130/b46412.pdfIn PDF document text
    • https://finolija.weebly.com/uploads/1/3/4/6/134625313/fedefenaberolug.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/cjeicjd/foworedukemuvudugoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_6013073a70208.pdfIn PDF document text
    • https://cdn.sqhk.co/pagifizipafo/4ifpiaq/82339651437.pdfIn PDF document text
    • https://widafesisitix.weebly.com/uploads/1/3/5/3/135321065/6662366.pdfIn PDF document text
    • https://rudabukonavapuk.weebly.com/uploads/1/3/4/0/134016662/deb496.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ffa870d861d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425913/normal_60261a39409a3.pdfIn PDF document text
    • https://rimofemosi.weebly.com/uploads/1/3/4/3/134351632/9822584.pdfIn PDF document text
    • https://fupegaketivira.weebly.com/uploads/1/3/4/8/134887529/sikemovugomifadokit.pdfIn PDF document text
    • http://kismykeitio.best/requirements_for_church_wedding_in_the_philippines_2018ak0pj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5fec11249cd54.pdfIn PDF document text
    • https://wisatevifo.weebly.com/uploads/1/3/0/7/130775851/jozebonu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389097/normal_5fde32dc21cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fcbd017a404b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388040/normal_5fffe9810fbbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_602878468fb85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 5224 bytes
SHA-256: 628fbca52057e71e976b9e8ec1d621561f48b3a85baf59492c0fd2b8b85c7ba4
font_01_sfnt_off0000fede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDE 10792 bytes
SHA-256: 9382ff47af5c20ddf6ddc31df100f00892d8ce61f3e28dadc2cbcdfb3e443eb3