Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc6600d0f542bc1c…

MALICIOUS

PDF

60.7 KB Created: 2021-01-23 23:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2fd62372323df1346e9806b78de0d9ad SHA-1: 8340bec534bf403a42c6728b5e126b4382cb54cc SHA-256: fc6600d0f542bc1cfc0fde46bafd74a681c0bfa5022e805b6ea5f92f50799a2d
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting a link farm or SEO spamming attempt. The embedded URL 'https://maypoin.ru/wb?keyword=autotrader%20denver%20used%20trucks' indicates a lure to a specific search query. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links, including a large number of PDF links, supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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/wb?keyword=autotrader%20denver%20used%20trucks PDF link annotation
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/gamom-kofofubelojiril-rirun.pdfIn PDF document text
    • https://posijakafit.weebly.com/uploads/1/3/5/3/135320461/pamepumojakavopidipe.pdfIn PDF document text
    • https://jeboxalu.weebly.com/uploads/1/3/0/9/130969965/wupurorodovu.pdfIn PDF document text
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/bd5c574e4be.pdfIn PDF document text
    • https://razotipelemato.weebly.com/uploads/1/3/0/7/130738732/d0911d03211.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/vozefisexilar-disebibefogid.pdfIn PDF document text
    • https://nolulanulupu.weebly.com/uploads/1/3/1/3/131379612/bdd9e1cb7635.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/nirevojun.pdfIn PDF document text
    • https://zibomuloxeju.weebly.com/uploads/1/3/2/8/132815028/bunilotedimute.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makidibe.epizy.com/extruded_polystyrene_sheets_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/form_6_superannuation_valuation.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/saxoduxef.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/free_vpn_android_china.pdfIn PDF document text
    • http://mudefikireneb.rf.gd/romantic_bollywood_movies_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/choices_mod_apk_2019.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_off0000b5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CA 5012 bytes
SHA-256: 9d221c75c4ac87ab3331389fc730b0224dfbd3ab088a0d1ad8ee7dd41d678f5f
font_01_sfnt_off0000c6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 9252 bytes
SHA-256: 271b5fe62fb46e6cbc193d5d663ac68b2f955574092fea98be817d91254f5b1a

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