Malicious PDF — malware analysis report

Static analysis result for SHA-256 21472856d1adf1be…

MALICIOUS

PDF

35.4 KB Created: 2020-06-11 19:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 377ba31705c7a34bd36f20d6e0e3ef02 SHA-1: f716e80e5337c8b139c07e7be72141258223b2ad SHA-256: 21472856d1adf1be87bcbc5cbb422ed425f775d7f5817edd26fe91e9756a8bc8
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO spam technique, likely intended to drive traffic or distribute malicious content. The ML classifier strongly supports the malicious verdict.

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://marcpagliarulo.com/uploads/1/3/0/3/130379463/130379463.html#soda+5+pdf+free+download
    • http://joy-neri.com/uploads/1/3/0/2/130289455/8419356.pdf
    • http://greenwednesday.org/uploads/1/3/0/5/130550690/kuginusafepijavenet.pdf
    • http://marcelgoerg.de/uploads/1/3/0/2/130287960/9721231.pdf
    • http://en.samarbete.org/uploads/1/3/0/3/130324370/tulozozevameras.pdf
    • http://hoouluainafarms.com/uploads/1/3/0/9/130969465/6583455.pdf
    • http://charbosworldofservices.net/uploads/1/3/0/5/130540795/daxomenepusevijop.pdf
    • http://hugbell.com/uploads/1/3/1/3/131380251/9838925.pdf
    • http://wobizsor22.com/uploads/1/3/0/4/130435509/869528394.pdf
    • https://nedomexapa.files.wordpress.com/2020/06/1161853936.pdf
    • https://xefosoxaxeni.files.wordpress.com/2020/06/jijexoxefatipo.pdf
    • https://vevivumofid184091929.files.wordpress.com/2020/06/rozax.pdf
    • https://subujitupus.files.wordpress.com/2020/06/kogofag.pdf
    • https://mebanome.files.wordpress.com/2020/06/5551973652.pdf
    • https://pewinutol.files.wordpress.com/2020/06/putajowokunafon.pdf
    • https://fijurabowo.files.wordpress.com/2020/06/fojuboxafu.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_off00005fa6.bin
ac7853d469811c4704f434cf27844cd549cdb10c1e49d7967c8d67773db78498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA6 10212 bytes

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