Malicious PDF — malware analysis report

Static analysis result for SHA-256 2385155fb51726ca…

MALICIOUS

PDF

72.1 KB Created: 2021-02-07 04:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6086e803952fe16b0ef6d3d0cf9b06a3 SHA-1: a618a8525c604ca96058ff78ac86d5c2b9480be9 SHA-256: 2385155fb51726ca408951333cfdf6e9506e4d520839c779b8a304223f74a05c
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various disposable domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the links likely serving as a lure or a distribution mechanism. The document body itself appears to be obfuscated or corrupted, but the presence of a URL related to 'casio g shock manual' suggests a potential lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://crophysi.ru/wb?keyword=casio%20g%20shock%205229%20ga%20200%20manual In PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/gamozedukot.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/rawaja.pdfIn PDF document text
    • https://wutiduxa.weebly.com/uploads/1/3/5/3/135300785/ee2531e8f346.pdfIn PDF document text
    • https://tewukowil.weebly.com/uploads/1/3/2/7/132741555/kuzajuke-vebeletajevi-kogivoruvurove-fubodezuxefu.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/3b84d.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/aEiglhe/dark_elf_name_generator_female.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_5fe519ab258f1.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/J9ggifY/las_vegas_tourism_august_2020.pdfIn PDF document text
    • https://pigabatanez.weebly.com/uploads/1/3/1/3/131380253/34d33986.pdfIn PDF document text
    • https://kapovisawok.weebly.com/uploads/1/3/4/6/134652754/xefideru.pdfIn PDF document text
    • https://kunagotuj.weebly.com/uploads/1/3/0/7/130739098/a39fa6e50.pdfIn PDF document text
    • https://kupalupatumer.weebly.com/uploads/1/3/1/8/131857031/negimegenoxekupom.pdfIn PDF document text
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/nimoxozopivose.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dibirat.rf.gd/29603091319.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_off0000dca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA2 5640 bytes
SHA-256: a6dfe532eff32f98f965bbdf49b565f0c527edc3a9efec88c6b1a820b83b60ba
font_01_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10524 bytes
SHA-256: 105624feab31d57765eb76b58884a3234a6a485016bc5b028bc39d3c05086e91

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