Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fb9daaa1daa3a4…

MALICIOUS

PDF

43.7 KB Created: 2020-04-10 02:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 10fc8016759be3e9a1220a8e04f0703e SHA-1: 1d32e42fe9439be3a885fd8c2568e04a20af8274 SHA-256: a7fb9daaa1daa3a48bf7aa2efb470406b77212d15a4be25b5a46d46180b84397
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 dynamically generated and point to PDF files on various domains. This behavior is indicative of a link farm or SEO poisoning tactic, designed to drive traffic to malicious or low-quality content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://theovercomersblueprint.com/uploads/1/3/0/2/130291556/130291556.html#z+for+zachariah+movie+ending
    • http://btdtracing.com/uploads/1/3/0/6/130639990/sumaxetelala_nixurikodo_felaretuv_gidinetam.pdf
    • http://youdrivemetodrink.net/uploads/1/3/0/7/130776174/387c04ca21.pdf
    • http://emiliemathel.com/uploads/1/3/0/4/130483364/dokagejalewajajuf.pdf
    • http://hsingconsulting.com/uploads/1/3/0/7/130738754/babukatadirepude.pdf
    • http://bravebeagle.com/uploads/1/3/0/7/130775540/d8ca7.pdf
    • http://ohiomsc.com/uploads/1/3/0/3/130379117/towazivetivid_kanesebi.pdf
    • http://polarityspin.com/uploads/1/3/0/7/130775109/64411bdec90753.pdf
    • http://papulse.net/uploads/1/3/1/3/131380138/mozonef_xozonipofasago_feginapaxuzul_nobukime.pdf
    • http://lilacsjoyandgrace.com/uploads/1/3/0/3/130313346/bitixokowar-fubova-wowep-gopularabujip.pdf
    • http://boldorganizers.com/uploads/1/3/1/4/131408942/kitonajudaneraba.pdf
    • http://madeinnola.org/uploads/1/3/0/8/130813514/121494ce0.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_off00007fc8.bin
dcb3b5a646f8251862ec2d805def2c839fb66867f2cf6162efbb63bb0f66ff32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC8 8628 bytes

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