Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c82996e8bd02ff…

MALICIOUS

PDF

35.7 KB Created: 2020-06-23 18:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed5922466c31b90e0890eabea70f2ca6 SHA-1: 9b733b5156fafb945a91eb2d7221f89d2035fe8a SHA-256: 34c82996e8bd02ff0e56c9e7540d9ef557bc1e20ba4f39f1d40524a60f666acb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, with numerous external URLs embedded within its body. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, indicating a high likelihood that these links are intended to direct users to malicious sites. The ML classifier also strongly supports a malicious verdict. No scripts were extracted from this sample, but the sheer volume of external links suggests a delivery mechanism for further malicious content or phishing attempts.

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://friendlyislandsxm.com/uploads/1/3/0/7/130776674/130776674.html#test+de+wisconsin+manual
    • http://matthewlundyportfolio.com/uploads/1/3/0/6/130621002/fegomusimalukovamid.pdf
    • http://officesupercharger.com/uploads/1/3/0/3/130324241/turutite_bagepa_tavajopusajox.pdf
    • http://risquemaiddetailingservices.com/uploads/1/3/0/4/130436182/mudaton_zemofopet_dikikugiwom_tufafaxeka.pdf
    • http://uscurrencyandephemera.com/uploads/1/3/1/0/131070571/6235776.pdf
    • http://princessprostour.com/uploads/1/3/0/7/130775678/2914714.pdf
    • http://thegoodnewsnow.org/uploads/1/3/0/8/130874308/fevikigipo.pdf
    • http://aleahgracebrookln.com/uploads/1/3/0/8/130813652/6590915.pdf
    • http://thefrosteddoughnut.com/uploads/1/3/0/6/130621158/9faa1d257c6b3f.pdf
    • http://general1948.com/uploads/1/3/1/3/131383383/1453577.pdf
    • http://firewall-server.tayma.com/uploads/1/3/0/4/130488506/6369b80a9731ae8.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_off00004a7b.bin
3e336571b2f776222bd1b4a6eaf31d6bce6033067a53f6c84bc4928344144608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A7B 4912 bytes
font_01_sfnt_off00005b21.bin
f45ad4ceb4261ee0ac957845857196c47ce37e777ecdb02b50fe7ba049ddc7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B21 13396 bytes

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