Malicious PDF — malware analysis report

Static analysis result for SHA-256 f893caa25139f338…

MALICIOUS

PDF

65.9 KB Created: 2020-06-21 07:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 083340422f9ec899296996cc69751e28 SHA-1: 8723b4414a283e3105d6faf36e5980bb51548e34 SHA-256: f893caa25139f3382091d9273ffe5fc2354058aa6aab0e09bf613af9a46ec2fa
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link

The PDF contains a large number of external links, many of which point to other PDFs with numeric slugs, indicating a link farm or SEO abuse. The primary external URI, http://etaincbd.com/uploads/1/3/0/2/130288600/130288600.html#basic+mandarin+pdf, is part of this pattern. This suggests the document is designed to drive traffic to malicious or deceptive content, potentially for phishing or malware distribution.

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://etaincbd.com/uploads/1/3/0/2/130288600/130288600.html#basic+mandarin+pdf
    • http://blogg.allegro-as.no/uploads/1/3/1/4/131405951/zujasebo.pdf
    • http://hostmaster.cpi-plasma.com/uploads/1/3/1/3/131378916/f59ec1a4.pdf
    • http://elysseceleste.com/uploads/1/3/1/4/131453715/a4b4f820.pdf
    • http://bluebeefarm.org/uploads/1/3/1/4/131453749/317611.pdf
    • http://hostmaster.izzylassmusic.co.uk/uploads/1/3/0/5/130539074/moxofi-dixizoxopa-womise-zevovibafove.pdf
    • http://gavinscartoons.com/uploads/1/3/1/4/131453041/naponubewe.pdf
    • http://cmi9800.com/uploads/1/3/0/7/130739627/8661083.pdf
    • http://titanwerks.net/uploads/1/3/1/3/131383921/8519192.pdf
    • http://leahjoyandsaintpatrick.com/uploads/1/3/0/2/130270781/5753994.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000527c.bin
cde21fdf85f5fa6b9ba16c21553281bb396e11d82176a53d3935bfaf2ca65fd7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x527C 39272 bytes
font_01_sfnt_off0000c734.bin
48b6613184155f37d66badc28dacbd585edcf9c16ce346ab6512ed7824ed1a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 4796 bytes
font_02_sfnt_off0000d74a.bin
66ccc936e1f5fd90a1ada526de0cccc964bc37a61096c6a9b3b0acf79b8007ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD74A 10512 bytes

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