Malicious PDF — malware analysis report

Static analysis result for SHA-256 055c1f3e384cb5f7…

MALICIOUS

PDF

31.0 KB Created: 2020-04-04 15:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6e0f221f9cd99cc53ebcae0749e32785 SHA-1: f2fd0defff74eb7b50da8628dcc566086b0c140d SHA-256: 055c1f3e384cb5f72b1121134cf6113b5631d208a6d24916c5ba90a8e4ee3f86
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of numerous external URLs suggests a potential attempt to redirect users to malicious content or engage in SEO spamming. The document's content appears to be obfuscated or corrupted, making a precise determination of its immediate purpose difficult.

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://francescocamuglia.com/uploads/1/3/0/7/130775260/130775260.html#regal+valley+view+grande+roanoke+va
    • http://bridgetoswald.com/uploads/1/3/0/7/130776166/fadesib_jisobuzadiji.pdf
    • http://modern-empire.com/uploads/1/3/0/7/130739256/ab13c856e13b4.pdf
    • http://wardiv.com/uploads/1/3/0/5/130551302/xulakukizutanaju.pdf
    • http://lurie-larochettetapestries.com/uploads/1/3/0/8/130874394/161064a.pdf
    • http://sweetblooms4u.com/uploads/1/3/1/3/131383384/fopuxarupe-menenibupakemid-ditolonozovefed.pdf
    • http://mwvhc-nh.org/uploads/1/3/0/6/130604181/7033744.pdf
    • http://stevenamiller.com/uploads/1/3/0/2/130288637/xisibew.pdf
    • http://mefgroup.org/uploads/1/3/0/9/130969576/lekav_kekodimemafubo_zawijetoxuwigu_kufumelivamazi.pdf
    • http://emilydelbridge.com/uploads/1/3/0/7/130738915/jarujowosupebibobi.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005329.bin
be7b98082b002ce2efa3f92cd312a91bc32988f2a7d266d7996e478bdbc94537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5329 7096 bytes

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