Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfd6df92ee5b419b…

MALICIOUS

PDF

82.7 KB Created: 2021-01-19 01:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c7825fc56da3b8b96eb73e9f0113e1b7 SHA-1: d933087d349db2fa2ed5e6114668fbe250b8b02e SHA-256: dfd6df92ee5b419b013ebdd3b38025841e9b00b3748969cd900d3f715c12d7c6
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 identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of the URL 'https://maypoin.ru/123?utm_term=megaman+x3+bosses' within the document body further supports this. No scripts were extracted, but the overall structure points to a deceptive lure.

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://maypoin.ru/123?utm_term=megaman+x3+bosses PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404966/normal_5ffdbb4913cdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384304/normal_5fb815ef270e7.pdfIn PDF document text
    • https://daxosunusopudom.weebly.com/uploads/1/3/4/5/134510034/ziluneti.pdfIn PDF document text
    • https://suxapenogabako.weebly.com/uploads/1/3/4/6/134602080/45fd80c79ed6bb.pdfIn PDF document text
    • https://xutewosabog.weebly.com/uploads/1/3/2/3/132303209/loguvarurigesoruf.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/9b0c5b4f.pdfIn PDF document text
    • https://lepitedow.weebly.com/uploads/1/3/4/8/134885181/zudebopezusi.pdfIn PDF document text
    • https://cdn.sqhk.co/sifapudoxig/eoohhSP/shelter_in_place_san_francisco_september_2020.pdfIn PDF document text
    • https://jodemugibinid.weebly.com/uploads/1/3/5/3/135347277/kuzizimib-lubezuzidojaru-nuponepito.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/eyJhija/33293693284.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/bupijila/environmental_science_and_human_population_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/79487172601.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_off000107df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DF 5252 bytes
SHA-256: fa6d27c3c6abe144180e7221628e167e6673b07a3026ca4ec6bd6c45b7225777
font_01_sfnt_off000119c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C3 10776 bytes
SHA-256: aba8e15e4bca43dcb072a52162bd948cdd43e3861f98e32ac4ee381a41a288eb

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