Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09420a11e12c76e…

MALICIOUS

PDF

79.2 KB Created: 2021-03-18 23:21:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62839029abdf7ed817b4c5ca2e8f1115 SHA-1: 920fffb0ee886720cce2826699d574a31e19c171 SHA-256: b09420a11e12c76e640df07581989375aa41b51b9fd96e14c6ccf1f8fe701258
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links points towards a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://leonvi.ru/wix?keyword=nsslha+sac+state
    • https://cdn.sqhk.co/loziromegon/iSTjcja/tax_calculator_france_2018-_19_australia.pdf
    • https://cdn.sqhk.co/mojupesonon/gtIIBhg/flights_to_las_vegas_from_atlanta_georgia.pdf
    • https://cdn.sqhk.co/gisatajofo/fNij15P/clay_pot_craft_kit.pdf
    • http://vulgargirls.fun/przymiotniki_dzierawcze_angielski_wiczenia_dla_dzieci0aqia.pdf
    • http://topvideo.design/33557821163a1eua.pdf
    • https://cdn.sqhk.co/semiwewedazi/SvHx9ib/xutajizajolisurel.pdf
    • https://cdn.sqhk.co/gopepilexafi/ifcijjj/99723884987.pdf
    • https://cdn.sqhk.co/neganobasiwe/MKji4jg/happy_birthday_advanced_piano_sheet_music.pdf
    • https://cdn.sqhk.co/lopijikuvi/ii2jfid/93304413119.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/daef4961-8b67-4ae9-b705-6f968897515c/7250444708.pdf
    • https://uploads.strikinglycdn.com/files/2c78e36d-3826-46d3-ba68-267333adcd01/96784381096.pdf
    • http://menimilerawapo.rf.gd/xugezo.pdf
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_2f0210458e5a4bab97d6a3c5cc6a54a3.pdf?index=true
    • http://lonozixugixapap.epizy.com/breitling_superocean_heritage_chronograph_44_manual.pdf
    • https://uploads.strikinglycdn.com/files/a49593e5-fe21-456d-909b-089c2fb0a480/olentangy_local_schools_spring_break_2020.pdf
    • https://41fe7446-7195-45c8-906d-de5e784989f9.filesusr.com/ugd/e02969_676b072f5c924b7995ae765b79559fd3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b656f3d0-dd37-49f7-8536-27ccdba15244/the_witcher_season_2_episode_1_release_date.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8f.bin
ba55e6887efeeb3866bf90389359292b0195e6d62509ba66b72a52d30b0eeaa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8F 4284 bytes
font_01_sfnt_off0000fa13.bin
2655eb8c8f3e2256c9db1ffb776e16c417ca298b5e41024e57f26726ce22f807		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 11300 bytes
font_02_sfnt_off00012060.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12060 4324 bytes

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