Malicious PDF — malware analysis report

Static analysis result for SHA-256 582b4ef64327c1fb…

MALICIOUS

PDF

44.9 KB Created: 2020-04-13 07:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f60a58e0600f3974dce3a96a90046eec SHA-1: 508ff3bb4dadbae5a97080a8b9acd96201665174 SHA-256: 582b4ef64327c1fb4bb33b5b4fd69182127f49d8e21e32fceca1cd007540c146
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to potentially redirect users to malicious content or phishing sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://bakaphoto.com/uploads/1/3/0/4/130476505/130476505.html#capresso+burr+grinder+user+manual
    • http://boatershuttles.com/uploads/1/3/1/3/131384101/viparawefujofaz-pobekupisarufu-fitub-puloputo.pdf
    • http://ephemeridesblog.com/uploads/1/3/0/5/130542983/ec747e77.pdf
    • http://johns-mobility.com/uploads/1/3/1/4/131407558/mutowifef-riperujunugimus.pdf
    • http://condorvisuals.net/uploads/1/3/1/4/131406564/75341d8eb7f.pdf
    • http://mylanye.com/uploads/1/3/1/3/131380485/2717012.pdf
    • http://jasminelozanointeriors.com/uploads/1/3/0/6/130621378/03a9518d82936a.pdf
    • http://avidandiyafinejewels.com/uploads/1/3/0/2/130273740/a9e220a0233.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_off000074d8.bin
4214aeeb136a2607f7520a4f34b71687410fa0cd9bc40eb750c4cf74654865b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D8 7680 bytes
font_01_sfnt_off000092e5.bin
cdfcec7897a1c94de9a5050e27ddc770a5126b403ca5c5b32d86f2269ecff58d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92E5 16036 bytes

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