Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab95d07bb0814e5…

MALICIOUS

PDF

46.2 KB Created: 2020-06-06 06:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: ffe08de27799619e94986846c5ae5b20 SHA-1: 4707daa447d9af758008d1343432cdfe18e6f099 SHA-256: 5ab95d07bb0814e5b9452c86bbfc59bbeddfba3a5146544a7524bcfe2c8ba06a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes URLs that are part of the link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sustainablefleet.com/uploads/1/3/0/4/130476649/130476649.html#d%25C3%25BC%25C4%259F%25C3%25BCn+dernek+1+s%25C3%25BCnnet+full+izle+tek PDF link annotation
    • http://motonorm.com/uploads/1/3/0/4/130435755/9061196.pdfIn PDF document text
    • http://cjocw.bpmtc.com/uploads/1/3/2/3/132303164/vasazomis_tuxuxow.pdfIn PDF document text
    • http://togetherforthelongrun.com/uploads/1/3/0/7/130739791/5031849.pdfIn PDF document text
    • http://galsinstitute.org/uploads/1/3/0/4/130479350/83dbeea94a.pdfIn PDF document text
    • http://sustainablefleet.com/uploads/1/3/0/4/130476649/terms.htmlIn PDF document text
    • http://sustainablefleet.com/uploads/1/3/0/4/130476649/dmca.htmlIn PDF document text
    • http://sustainablefleet.com/uploads/1/3/0/4/130476649/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xujesowoze.files.wordpress.com/2020/06/zedidejipi.pdfIn PDF document text
    • https://baxurof.files.wordpress.com/2020/06/1440426049.pdfIn PDF document text
    • https://gabixuke.files.wordpress.com/2020/06/10989003785.pdfIn PDF document text
    • https://bizupugol.files.wordpress.com/2020/06/16506442264.pdfIn PDF document text
    • https://zadogaw.files.wordpress.com/2020/06/pigimajeloveri.pdfIn PDF document text
    • https://sunewizev.files.wordpress.com/2020/06/milamejujezaxolenewosir.pdfIn PDF document text
    • https://siluvewonuno.files.wordpress.com/2020/06/93691548276.pdfIn PDF document text
    • https://gimasesagix.files.wordpress.com/2020/06/nopiwuwegakulomikulewez.pdfIn PDF document text
    • https://depikujo.files.wordpress.com/2020/06/parajuvevunupepaz.pdfIn PDF document text
    • https://gipofonamu.files.wordpress.com/2020/06/xazutokixofelipuduru.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6481 16696 bytes
SHA-256: f8e7a8c125c07eb4b1d900b541b76e2c6c191ebc4490167ffbc3791258dc9a33
font_01_sfnt_off00009574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9574 16140 bytes
SHA-256: 4fe94d0d01e3fc85851e78d971ea394167cca9f5539491c06b64ba9eee8df098

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