Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a3f6a7b17c3db2…

MALICIOUS

PDF

75.1 KB Created: 2021-02-20 03:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f2f8fc6c74ddec55e6a4c015f8e7f3f4 SHA-1: 47cc1ee80ec02a33ea5434ac3e0d397e3341291e SHA-256: 56a3f6a7b17c3db2ad186cfd1539f47c91eef6444f7a003c5a61bfd6a89dc57b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The primary URL, 'https://baarspo.ru/strik?utm_term=jesus+was+a+child+like+me+song', suggests a potential phishing or scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://baarspo.ru/strik?utm_term=jesus+was+a+child+like+me+song PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383573/normal_5fe5c2e45ba20.pdfIn PDF document text
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/4015663.pdfIn PDF document text
    • http://lujakivuvig.22web.org/wonopu.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/3585633.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/aidlcgh/36305251034.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/Wjfhfjf/pandora_x_star_wars_uk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448548/normal_5ff8a8106b46d.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/D9aheN5/tiwuguwakekarefexuwivos.pdfIn PDF document text
    • http://bevibopo.22web.org/fiwabewedol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fceb63f68ab5.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/idYjg7G/nasacort_coupon_code.pdfIn PDF document text
    • https://xinusikavafomi.weebly.com/uploads/1/3/4/3/134353784/tovimakibifetin_bipezem_ziwaked_jegatowir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448539/normal_601b788705c4f.pdfIn PDF document text
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/3612197.pdfIn PDF document text
    • https://cdn.sqhk.co/dabozijide/aFZbAWH/jizesexijobirejogiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374983/normal_5fd7dc3a9712a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vusizudufekope.epizy.com/59103620851.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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 5404 bytes
SHA-256: a93b7c095364b6e6786151ae61aeb606eb8ab38e5864653ba76a55cd4c77e3b5
font_01_sfnt_off0000f980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF980 11064 bytes
SHA-256: c5e3a06b3673b7a87a5be1ca20e96956115a3c5d601f5cd7b2ece7e1db550f7f

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