Malicious PDF — malware analysis report

Static analysis result for SHA-256 135e35c90f766e17…

MALICIOUS

PDF

71.2 KB Created: 2020-12-24 06:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 93700b237b8397f8432ffbd95ed5010e SHA-1: 92e78aaf82be80ba8ec295487242d2fd512d0418 SHA-256: 135e35c90f766e17ba668a27cc64919e7a759e2ea6112446a98979dda58079f5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body appears to be garbled, suggesting it is not intended for human consumption but rather as a lure or container for malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=bomberman+nes+game+free++for+pc In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403276/normal_5f998db49aa36.pdfIn PDF document text
    • https://mabedokuk.weebly.com/uploads/1/3/4/5/134582143/gaxazasurekabapixi.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebosatu/QifKii6/91454554630.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/Shajan8/wyze_camera_amazon.pdfIn PDF document text
    • https://beritugemob.weebly.com/uploads/1/3/4/3/134332724/df665179008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f9da149ac05d.pdfIn PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/rejisegujubil-kawab-bixoz-lomob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375694/normal_5fc3e77370e50.pdfIn PDF document text
    • https://zavebunerug.weebly.com/uploads/1/3/4/3/134358754/jewut.pdfIn PDF document text
    • https://kewojifusufiw.weebly.com/uploads/1/3/4/6/134662328/derofopexipepizalul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422372/normal_5fa629aa6cbfb.pdfIn PDF document text
    • https://zafozudakajadev.weebly.com/uploads/1/3/0/8/130814863/raxozu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383577/normal_5f93da752b47a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wozoxub/creme_brulee_9_word_cookies_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/tai_anger_of_stick_4_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/getamikuvetiduzapisezi.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/difference_between_vedic_and_buddhist_system_of_education.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_off0000d8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EF 5492 bytes
SHA-256: 4f93441814ed2f6895e837794a8d519c2192bfcd385c48e023ce2c11774611d1
font_01_sfnt_off0000eb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB89 10628 bytes
SHA-256: dacde7565365296e948bbfa9f5cf17418327a7a65b10bc3aab78f70a57e759e2