Malicious PDF — malware analysis report

Static analysis result for SHA-256 d11a5e1824621ea0…

MALICIOUS

PDF

73.1 KB Created: 2021-02-18 23:19:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 851550592f88f3e4a7621d3232de6214 SHA-1: 516b8d6f4622f79af1d3417aee30b3b74d464576 SHA-256: d11a5e1824621ea0cc4409944215ef0825ac2a6fc5f5aafdb73f5680fc0b3256
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. Heuristics confirm the presence of malicious redirector links and a link farm structure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its suspicious link distribution pattern.

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
  • 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://yafferge.ru/wix?keyword=krups+nespresso+essenza+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5fedcc2904de6.pdfIn PDF document text
    • https://cdn.sqhk.co/zamepeja/fnMTdha/bosapirada.pdfIn PDF document text
    • https://tonuwuro.weebly.com/uploads/1/3/0/7/130739505/bivilatudobofuvosa.pdfIn PDF document text
    • http://leree6.club/zasonusajazujiwizapouxpr0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449630/normal_5fd086a3144a0.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/hiihb0u/61634269217.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/diggeji/67318891772.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/hbk5zia/80285913492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_600fa637ec63d.pdfIn PDF document text
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/powipenenegovad.pdfIn PDF document text
    • http://esportzmlevent.com/choi_chicken_invaders_5_onlinefynze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379602/normal_5fe112571d257.pdfIn PDF document text
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/4050976.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/49641843612zgkay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_601fafa5b53c1.pdfIn PDF document text
    • http://dalnoboyi.xyz/the_self_taught_programmerpshnk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475392/normal_5ff2041c44f38.pdfIn PDF document text
    • https://betunujaxub.weebly.com/uploads/1/3/1/6/131636576/e264b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_5fdbbd64abd07.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_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 4984 bytes
SHA-256: 76abb763644426098eb2535cc93c20e3196b7a19ed83ff7c6d8ff1d4450b22f3
font_01_sfnt_off0000f45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45C 10192 bytes
SHA-256: 6b4d97f62a1a95411c9cca6c4858f4d914efa5582f686834e384c7044b9d7a3b

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