Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28fb7557d316cee…

MALICIOUS

PDF

39.3 KB Created: 2020-03-08 08:55:49 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d64ba3eb28efc94a443069a7adb33561 SHA-1: 1fbb0b0baf3419e2b0f3f692f1225832f4e3a14a SHA-256: d28fb7557d316cee66002a36994ce111fc5621be3c9e1866a900010c7c17a60a
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF files hosted on various domains. The primary URL, http://pressurecleanit.com/uploads/1/3/0/7/130738739/130738739.html#libro+embarazo+pdf+gratis, suggests a lure for free PDF downloads. The ML classifier strongly flagged this sample as malicious, indicating a high probability of malicious intent behind these links, likely for SEO manipulation or to distribute further malware.

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://pressurecleanit.com/uploads/1/3/0/7/130738739/130738739.html#libro+embarazo+pdf+gratis
    • http://themodestcollection.com/uploads/1/3/0/7/130776034/9847236.pdf
    • http://jmdhealthcare.com/uploads/1/3/0/6/130620456/8073803.pdf
    • http://jasonwilke.com/uploads/1/3/0/8/130873955/vukigidovebajo.pdf
    • http://skylarrubyy.com/uploads/1/3/0/5/130550844/pezadivifo.pdf
    • http://www.umlf.com/uploads/1/3/0/7/130738912/60911.pdf
    • http://amiciasamenities.com/uploads/1/3/0/4/130476048/9083908.pdf
    • http://athleticdad.co.uk/uploads/1/3/0/6/130604530/2725176.pdf
    • http://structuraldamage.org/uploads/1/3/0/4/130489122/gutemib_mesuvovunoge_nifamokefipiza.pdf
    • http://iteroimplantdentallab.com/uploads/1/3/0/4/130477064/rotalus-waruzalag-lazadug.pdf
    • http://yanibear.com/uploads/1/3/0/6/130604322/7088513.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_off00006349.bin
20cc70a4cd3640921b08d510366921e0d46aeb1325025813c915ef359ef8c783		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 9404 bytes
font_01_sfnt_off0000850e.bin
a1600c79331cba21b3b4a1f056a9d989f02b1280d9db796053b5096bff0b23f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850E 2000 bytes

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