Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd4b7c084367fba9…

MALICIOUS

PDF

96.5 KB Created: 2021-03-02 14:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c5e5ba512b4ee90f2d5b8704e6e2d44e SHA-1: 2a02b3276d6f888f190446bcb355964c09e7a319 SHA-256: bd4b7c084367fba9ede7aca7e06483eed2f5d1353da8ff94be414d13e8ea9fa8
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malicious redirection attempt, likely initiated via a spearphishing attachment.

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/award?keyword=how+to+defrost+samsung+rf28hmedbsr PDF link annotation
    • https://dozetiwe.weebly.com/uploads/1/3/1/8/131856451/094580f265.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/ruvexaboxet-kinip-panujolu-fewit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457312/normal_600083400d8a2.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/76405341742.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/eggDibV/aliens_vs_pinball_unlocked.pdfIn PDF document text
    • http://bometaximom.scienceontheweb.net/63489857409.pdfIn PDF document text
    • https://letenotej.weebly.com/uploads/1/3/4/5/134595585/dodokefimufu.pdfIn PDF document text
    • https://velineninebag.weebly.com/uploads/1/3/4/6/134608195/63e208bd846e41.pdfIn PDF document text
    • http://makebugobiwuka.mypressonline.com/asus_rt-n66u_set_static_ip.pdfIn PDF document text
    • https://vowopazi.weebly.com/uploads/1/3/4/0/134096587/kadoxoki.pdfIn PDF document text
    • http://xejopegig.mypressonline.com/45747630995.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/devuxuzejozam/background_images_hd_1080p_free_bike.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/51968443067.pdfIn PDF document text
    • http://pujumek.myartsonline.com/50887381965.pdfIn PDF document text
    • http://zuvuzevo.atwebpages.com/physiology_costanzo_6th_edition.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_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 5644 bytes
SHA-256: 77884d4fbde9fc1e78874af8e7e2beeb8def6f2d644a56feb5d0b2b79b325722
font_01_sfnt_off00014307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14307 10476 bytes
SHA-256: c7c9e4ea66d96016f4dc718e1ffb3be78fede9e05584d23c524c69e2066c122a
font_02_sfnt_off000166dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166DD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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