Malicious PDF — malware analysis report

Static analysis result for SHA-256 abbcc384ee51e61c…

MALICIOUS

PDF

43.1 KB Created: 2020-03-12 10:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f56e409bd36dca06d5d33793843fb10f SHA-1: 67adea0b3cb1cf5f55be7e708278b4ba0745a81b SHA-256: abbcc384ee51e61cb224d5de8637740b15b4e2c6963485e8ca1e1a907a265593
94 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, with a high number of external URLs pointing to other PDF files. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern. The document body contains text related to stages of group development, which may be a lure, but the primary malicious activity appears to be the distribution of numerous links.

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://befreetherapy.com/uploads/1/3/0/4/130476587/130476587.html#forming+storming+norming+and+performing+stages
    • http://faddishdna.com/uploads/1/3/0/4/130489122/tifolo.pdf
    • http://mx.stcloudchurchofgod.com/uploads/1/3/0/8/130873741/430609.pdf
    • http://www.grundeglass.com/uploads/1/3/0/2/130274076/medifas.pdf
    • http://octobooty.com/uploads/1/3/0/6/130605069/1347160.pdf
    • http://woodbinefarmandbrewery.com/uploads/1/3/0/6/130621089/90009d86.pdf
    • http://lindiesfurniture.com/uploads/1/3/0/8/130874652/tosugebunebiro_fasepozazewekot_vuxikagedowobo.pdf
    • http://purseonalityny.org/uploads/1/3/0/6/130621545/2541350.pdf
    • http://purseonalityny.org/uploads/1/3/0/7/130775429/fizozevak_dutufatutozajut_bexitotite.pdf
    • http://www.andorra55.com/uploads/1/3/0/4/130483940/3498664.pdf
    • http://www.kathkhemicals.com/uploads/1/3/0/2/130272353/3795129.pdf
    • http://weddingjunket.com/uploads/1/3/0/6/130604210/fatajigemuwi.pdf
    • http://mikalivingstonart.com/uploads/1/3/0/8/130874250/befasagumanum.pdf
    • http://mail.bigballoonscreations.com/uploads/1/3/0/6/130621893/6938294.pdf
    • http://antarctic-huh.com/uploads/1/3/0/4/130435582/pakukewuxufo.pdf
    • http://bardfamilymarketgarden.com/uploads/1/3/0/4/130489803/sezasopipaga.pdf
    • http://www.fptcl.com.fj/uploads/1/3/0/7/130739980/f225240178c.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_off000077be.bin
34ddf8522b413b24ac488e733b5a9cf2b282d23c7cd1f02ac58396a27f0e992d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 7548 bytes
font_01_sfnt_off00009543.bin
ccdb513f9f9b997ab503fae1484a3e920b4b4fc659fa9bd94a418ce32750de73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9543 2600 bytes

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