Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfd1d583d923973…

MALICIOUS

PDF

36.0 KB Created: 2020-04-08 20:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: 2edd8f43b9516b6d4a75feb69bfbc0cc SHA-1: c475ece5b6563ccda63e18d4f0deaab30280dfa7 SHA-256: cdfd1d583d9239731e91df3727b9e588ad84e54cb572d89302d27757237740e2
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, contains references to 'Autocad lt 2016 software' and URLs that appear to be part of this scheme. The ML classifier strongly indicated maliciousness, supporting the interpretation that this PDF is designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://longlastingautodetail.com/uploads/1/3/0/7/130776324/130776324.html#autocad+lt+2016+software PDF link annotation
    • http://fundycounseling.com/uploads/1/3/0/5/130551599/gosafasawij_sakel_fovipup.pdfIn PDF document text
    • http://gayejee.com/uploads/1/3/1/3/131379340/vokew_noguduvikenu_sigimafeselawa.pdfIn PDF document text
    • http://ahplastering.net/uploads/1/3/0/2/130289601/19ec478bd615.pdfIn PDF document text
    • http://whytransportrides.com/uploads/1/3/1/3/131383954/gagibazevi_joliw_duwivapafeje_betobuselefepe.pdfIn PDF document text
    • http://nosymptom.org/uploads/1/3/1/3/131381881/fafebuwa.pdfIn PDF document text
    • http://ecceko.net/uploads/1/3/0/4/130488152/finijol.pdfIn PDF document text
    • http://richmondhouseclay.com/uploads/1/3/0/6/130639292/3807498.pdfIn PDF document text
    • http://etvetus.com/uploads/1/3/0/5/130538833/f2fd39501bbb1e0.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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6354 8272 bytes
SHA-256: 92b4d79468f6f45361cbee2db671da0795cfee0742179b316a70573cca3b5418

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