Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5c9dfe49072e86…

MALICIOUS

PDF

44.4 KB Created: 2020-04-08 00:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c904bbb6856d9103a12adff5c062ede2 SHA-1: 9b6a25fc8a4ed5e982a107d85bbc0b5da6628f82 SHA-256: 5d5c9dfe49072e8678b96ffd26e80d4d476084670b483a1fc4ba69f94541ddce
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating it is likely a dropper. The document body contains numerous embedded URLs pointing to external PDF files and HTML pages, suggesting a link farm or SEO spam tactic to distribute further content. The presence of external links and the dropper classification strongly suggest an intent to redirect the user to malicious sites or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8896457-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8896457-0
  • 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://ylfreedomteam.com/uploads/1/3/0/6/130603941/130603941.html#802.+11n+nic+usb+driver
    • http://tiedinvermont.com/uploads/1/3/0/8/130874601/vebifotalowevurojaw.pdf
    • http://cavephase.com/uploads/1/3/1/3/131382406/sasurav_vikojolejo_fedeku_sewota.pdf
    • http://sunstonefulfillment.net/uploads/1/3/1/4/131437616/penololomesujel.pdf
    • http://lindalebc.com/uploads/1/3/0/6/130621294/vuroxe-lepisiv-soladefabo-kazexiza.pdf
    • http://aguadecalornatural.com/uploads/1/3/0/6/130604595/sifikino-dajumobozar-defok-rofizo.pdf
    • http://makahisland.com/uploads/1/3/0/4/130476483/forefedasi.pdf
    • http://fecapital.org/uploads/1/3/0/8/130815351/7100800.pdf
    • http://gailbliss.net/uploads/1/3/0/7/130775935/zazogifupate.pdf
    • http://mjrfloors.com/uploads/1/3/0/6/130639164/basabisawarej.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_off00008309.bin
53eb785334abcb32da0754139dcd10a50626ac1364de00b5b3df565abd82f92a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8309 10024 bytes

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