Malicious PDF — malware analysis report

Static analysis result for SHA-256 a000570fc022a5ee…

MALICIOUS

PDF

72.7 KB Created: 2020-04-16 03:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c91693bc56812d90b189a311d025a1d SHA-1: d2aef356e2a7f9bb17c45af4c78b5a5d541ee154 SHA-256: a000570fc022a5ee91d1addb39cca6245c8c3abc8fbd6077fb9336f4616c6812
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. The document body text, though heavily obfuscated, contains references to 'chs online form 2019 class 6 date', indicating a lure to a fake form. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a large number of external URLs, likely for phishing or to host further malicious content.

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://bodyonfleek.org/uploads/1/3/1/3/131380892/131380892.html#chs+online+form+2019+class+6+date
    • http://jordansplaylab.com/uploads/1/3/0/2/130271152/mevemarilarore.pdf
    • http://savageownsyou.com/uploads/1/3/0/5/130543264/94d6e856eaeb.pdf
    • http://bpresent.org/uploads/1/3/0/5/130550910/feletojev-vulipatolup-jimilitexed-luwego.pdf
    • http://bearam.com/uploads/1/3/0/8/130814859/rovosa.pdf
    • http://assurancecapital.org/uploads/1/3/0/9/130969992/8236783.pdf
    • http://jackshacks.co/uploads/1/3/0/5/130540592/6af2cf5d8b.pdf
    • http://credentialize.net/uploads/1/3/0/9/130968958/mitizuvixi_reserox_zovawa.pdf
    • http://lookatmyunion.org/uploads/1/3/0/7/130738719/7614236.pdf
    • http://thehallofframe.com/uploads/1/3/1/1/131164452/9424057.pdf
    • http://boucherlandscaping.net/uploads/1/3/0/2/130291809/pejovoridati.pdf
    • http://libomusic.com/uploads/1/3/0/3/130313643/fezilamubafib-wijexifubulov.pdf
    • http://justyourwayprints.com/uploads/1/3/1/3/131398066/6653392.pdf
    • http://iotcolumbia2016t05.com/uploads/1/3/0/8/130873795/darolalorizidawi.pdf
    • http://mindfulnesscenteronline.com/uploads/1/3/0/8/130874049/6352099.pdf
    • http://listmeow.com/uploads/1/3/1/3/131379394/tawetenisisun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b00c.bin
1957428794578a072b8983e864e5701b52391162abfb2d6d14c6295fa8a16687		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 6444 bytes
font_01_sfnt_off0000bfce.bin
3f55a50bca067ce4abf1176e6f28bb9f4c316eaee8ccc194b620bf39e1dcd65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCE 8540 bytes
font_02_sfnt_off0000e08e.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 1388 bytes
font_03_sfnt_off0000e7f4.bin
d39d9a46d7a90bbca90970ebd71501a3659cf436c8083f7cf29afbdc9870d221		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 15456 bytes

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