Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a9aa2b59971963…

MALICIOUS

PDF

34.6 KB Created: 2020-04-15 09:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fcae33a2e5cab59c79d7fbb5c761a6ba SHA-1: 5b08b88e2ec1ab2add77f38ddd06a0494684d513 SHA-256: 76a9aa2b599719630799a4cd7fc777b6e483e16340f28d460b7448901c627c67
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spamming operation. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous URLs pointing to various domains indicates a likely attempt to redirect users to malicious content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://amityhairstudio.com/uploads/1/3/1/0/131070799/131070799.html#the+reason+hoobastank+piano+sheet+music
    • http://stald-skovsgaard.dk/uploads/1/3/0/5/130542734/3b4185c03a770.pdf
    • http://latoletada.com/uploads/1/3/0/4/130488294/kusaser.pdf
    • http://877144107780710590.com/uploads/1/3/0/7/130775544/25621a702bc.pdf
    • http://kevindalymusic.com/uploads/1/3/1/4/131437845/8005521.pdf
    • http://leftbehindkid.com/uploads/1/3/0/3/130323523/zugukexupokuwepexigo.pdf
    • http://miraculousworksllc.com/uploads/1/3/1/4/131455543/ea0ac440e95.pdf
    • http://vanitypress.org/uploads/1/3/0/8/130813840/zugasifa-safafi-mufozuxurok-beboruwomen.pdf
    • http://dadeclinic.com/uploads/1/3/0/9/130969061/193916.pdf
    • http://southern-charm-yoga.com/uploads/1/3/1/4/131453348/xonekunitujegugi.pdf
    • http://ten26marketing.com/uploads/1/3/0/6/130604724/2709247.pdf
    • http://migseriouslda.com/uploads/1/3/1/3/131383439/gabidopimuk_jexamub.pdf
    • http://pdinternational.net/uploads/1/3/0/6/130604465/046b07.pdf
    • http://gsentertainment.net/uploads/1/3/1/0/131069893/favurime-tipufek-davap-jozezugebigu.pdf
    • http://precisionaluminumconstruction.com/uploads/1/3/1/3/131382447/xulege.pdf
    • http://ebhum.org/uploads/1/3/1/3/131398444/4e1328ac174725.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_off000057b3.bin
e92f1081e0d95ddb012222b547910ef03976b6c578e5627473dc6d8b7c6b2fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B3 7476 bytes
font_01_sfnt_off0000751e.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751E 1708 bytes

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