Malicious PDF — malware analysis report

Static analysis result for SHA-256 4805b1c072aee408…

MALICIOUS

PDF

77.3 KB Created: 2021-04-09 10:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b85c4053c9855f36846884f76bc4c72a SHA-1: eebc62a52485a7795db2f6085c925536fca8ba9f SHA-256: 4805b1c072aee408c9ba90d933fcae03bffc8475072805ea7d0adc0cd59b1f68
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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.
  • 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://mezovuduw.ru/strik?utm_term=substitute+for+type+a+transmission+fluid PDF link annotation
    • http://supportcopyright.net/4127859605sadvx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_60548049e8bf8.pdfIn PDF document text
    • https://cdn.sqhk.co/fipufose/jJMdF6e/zawuxobuxobopokixopajil.pdfIn PDF document text
    • https://fopojikanerev.weebly.com/uploads/1/3/4/8/134888820/a12b44ca5.pdfIn PDF document text
    • http://profoto22.ru/get_user_group_id_linuxxtf8y.pdfIn PDF document text
    • https://cdn.sqhk.co/konajera/midESva/36649026860.pdfIn PDF document text
    • https://cdn.sqhk.co/jedugifaxido/ckupjfA/vewupenowa.pdfIn PDF document text
    • https://cdn.sqhk.co/gorigaserata/j7eb5za/almanca_renmek_istiyorum.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/w0jfZkB/quiz_buzzer_app_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_6011d8fd88dc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413455/normal_5fe23f4daefef.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/dp4xX3X/disneyland_hotel_dining_parking.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/brgjNI2/wwe_raw_roster_2019.pdfIn PDF document text
    • http://constructionhouse.info/472567548445gl31.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/inicig9/micro_battles_3_full_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/eigJjcT/download_game_extreme_drift_2_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385214/normal_5fe18bffe6128.pdfIn PDF document text
    • https://cdn.sqhk.co/saxamabewido/fiihfjg/muvusakora.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/896670.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/nexaragena_gagiz_numuwesusatew.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/jhZYghC/21938996176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410194/normal_5fe57b224f12e.pdfIn PDF document text
    • https://nubipudovolena.weebly.com/uploads/1/3/4/0/134012318/lotirifatokareju.pdfIn PDF document text
    • https://cdn.sqhk.co/fajixojemom/k7Czhe5/jhu_apl_glassdoor.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/gc3sjiq/harvard_business_review_managing_your_boss.pdfIn PDF document text
    • https://cdn.sqhk.co/lagazowasobo/yJfheij/apology_letter_format_to_hr_manager.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 5532 bytes
SHA-256: 6a14c6fa282cfc4fa37c1b934b2592941cb56bd0c97d21da29d5b37389ea805a
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 10868 bytes
SHA-256: 78ad161d1278c2f0d1418b3d7344cb094f2585dedac541d0a2546ed38dc83e5d