Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a2022f1d216183…

MALICIOUS

PDF

45.6 KB Created: 2020-04-11 07:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e5bf7e0b02a60fc0c328f1a19f6d417a SHA-1: 07568e42208ebabfd10bf7d8166dfb021e7af87a SHA-256: 20a2022f1d21618391b5d2e53fb9d94ba4d65203aafa8948c4bc89d1a7824801
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure referencing a 'Microsoft office click to run virus' and embeds a large number of links to other PDFs hosted on various domains. This indicates a link farm strategy designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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 http://miracleinabucket.com/uploads/1/3/0/2/130272424/130272424.html#microsoft+office+click+to+run+virus
    • http://friendshipfields.com/uploads/1/3/1/3/131398144/sewakonuboxesifirej.pdf
    • http://freestitching.com/uploads/1/3/1/1/131164238/nireme.pdf
    • http://colossal.vip/uploads/1/3/0/6/130639751/6866094.pdf
    • http://olamaurace.com/uploads/1/3/1/0/131071062/df2316.pdf
    • http://transbusiness.fr/uploads/1/3/1/3/131380052/3261404.pdf
    • http://kylielyall.com/uploads/1/3/0/2/130288486/2454150.pdf
    • http://dgmetc.com/uploads/1/3/0/8/130813307/bowiwadaf-jikulutowig-xawiribuna-nusiferujev.pdf
    • http://johnwinogrocki.com/uploads/1/3/1/3/131380339/dc09c8.pdf
    • http://jicole.com/uploads/1/3/0/2/130273571/pifonosar.pdf
    • http://mindregard.com/uploads/1/3/1/4/131454116/e52d5.pdf
    • http://palmoil-expo.com/uploads/1/3/0/2/130271030/tukajezigazir.pdf
    • http://standingforchristmimers.com/uploads/1/3/1/4/131452997/gofupesuvito_gikuwedopiwaz_vowewagobon_wukurufir.pdf
    • http://helpadogbbq.com/uploads/1/3/0/8/130874157/7140761.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000751f.bin
585188438577fae1bf1cbc6d848fca1aad619264acb5c7e10d631ec1aa02d61b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751F 8408 bytes
font_01_sfnt_off00009546.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9546 16036 bytes

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