Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae57fa4e8df8085…

MALICIOUS

PDF

72.5 KB Created: 2021-05-24 09:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9e908bc5793946eb778a50490bc24f94 SHA-1: 1be873b9f43f9d6c22d957b9f0198b6eea76fb88 SHA-256: 4ae57fa4e8df8085486a8b9796f5858c435d3404c004be9e085960e168f23e40
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://pelibifir.ru/strik?utm_term=formula+para+convertir+de+metros+lineales+a+metros+cuadrados', is likely part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=formula+para+convertir+de+metros+lineales+a+metros+cuadrados PDF link annotation
    • https://kubazavazagemu.weebly.com/uploads/1/3/4/4/134464578/174805.pdfIn PDF document text
    • https://sorunamupojiwek.weebly.com/uploads/1/3/1/4/131407183/vuvinirikiletolemup.pdfIn PDF document text
    • https://fitabidik.weebly.com/uploads/1/3/0/7/130776693/8519059.pdfIn PDF document text
    • https://vonipelimodaro.weebly.com/uploads/1/3/0/7/130738487/799e5fd667e.pdfIn PDF document text
    • https://nonizevotete.weebly.com/uploads/1/3/1/3/131384281/jedaxisigifumima.pdfIn PDF document text
    • https://debagodijif.weebly.com/uploads/1/3/0/9/130969595/domalinabonira.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486994/normal_5fc8c7f7f024e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368240/normal_5fc80adfd4ecf.pdfIn PDF document text
    • https://guwusupokase.weebly.com/uploads/1/3/1/4/131437041/f5ebc04be.pdfIn PDF document text
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/6649216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381532/normal_5fcddd3467bf3.pdfIn PDF document text
    • https://gubuwogufulero.weebly.com/uploads/1/3/4/6/134608521/mesabezifinot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60160fa28f7ef.pdfIn PDF document text
    • https://boxomuti.weebly.com/uploads/1/3/4/0/134016719/9703760.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/rofijuzoniduji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_60410d45d456f.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/7701757.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/pusori/31833839421.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/maytag_maxima_xl_washer_drain_filter.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/tosunapowije.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/fokovetotivopegeg.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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 5232 bytes
SHA-256: a98d18a626784e66a0f40aebaf9b2cbc9de13aab8514fb46339423730910fb0e
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 11288 bytes
SHA-256: 8e9997864c32e4d50ffbc10bf0a086b280836bfb7ecff09d8b5eecd2cbf0c545

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