Malicious PDF — malware analysis report

Static analysis result for SHA-256 675cc9d9d6a4b179…

MALICIOUS

PDF

80.8 KB Created: 2021-04-17 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 89750ee2ad22950e423848c629ddbaa4 SHA-1: 7c7751cb256c288914b6a0747169721a7014bd6e SHA-256: 675cc9d9d6a4b179cdeba14354ae245bebdcca52b6e882325337b70add0ca83d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to job search queries, directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=how+long+is+a+typical+shift+at+starbucks PDF link annotation
    • http://tomogorman.com/hoover_windtunnel_2_rewind_pet_brush_not_spinningqa88e.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/Phgjagh/93538982952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454042/normal_602df7a79c6d7.pdfIn PDF document text
    • http://widonatozeg.mypressonline.com/converter_para_musicxml_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bigulikexupa/Zylhgij/xejesopibetubozow.pdfIn PDF document text
    • https://cdn.sqhk.co/nerutamar/jhaIhgh/weather_today_at_my_location_in_fahrenheit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fea1cb1ba2a9.pdfIn PDF document text
    • https://cdn.sqhk.co/gegenosuzun/doIjjig/wenex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_6006503bec48b.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/OBgfhe1/mymcps_portal_login.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/6002329914.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/acrobat_reader_pro_zusammenfgen.pdfIn PDF document text
    • https://cdn.sqhk.co/feduvefas/1LfNPVj/94323455259.pdfIn PDF document text
    • https://cdn.sqhk.co/zozijawutuxu/hhhehfE/769360035.pdfIn PDF document text
    • http://subbellassecret.com/77784185375xqp6i.pdfIn PDF document text
    • https://cdn.sqhk.co/wanowofimaz/hcicgeQ/12855176071.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rixigor.onlinewebshop.net/rakemixotugapalijudeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd48884-6258-4018-a4d8-5b177165c5e8/sulozinugovakiziriloson.pdfIn PDF document text
    • http://sabiwilurase.atwebpages.com/ponefuvotapufogezon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1d6d11b-64b2-45e6-a64a-2137d9a712c2/5263779048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b282bc-7b80-4038-b563-f91a55de5217/boss_dd_20_power_consumption.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867fafec-091d-4db2-a7cb-4326e93f9b48/pictures_of_ernest_hemingways_house_in_key_west.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF74 5400 bytes
SHA-256: 5273523b985bf17245fd005e02cd8e4cb0e9e3d3c9c171d64c0256849d05b8f1
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 11092 bytes
SHA-256: f01836c443141caed10e2c9666062e8aabc561cdbb5cc150b74e69bccd5478f3
font_02_sfnt_off0001279e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333