Malicious PDF — malware analysis report

Static analysis result for SHA-256 50928207314cec4a…

MALICIOUS

PDF

79.0 KB Created: 2021-03-03 11:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7605e92fad978d9f98501549662ead43 SHA-1: 899b0e13595dc6162c89a7ec430c9b1f9169f2e7 SHA-256: 50928207314cec4a2fee8dbb64552a6615ccc4133d8a6613f493222d69660825
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains and subdomains of services like 'weebly.com' and 'sqhk.co'. This pattern is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/award?keyword=how+to+do+basic+chemistry+conversions PDF link annotation
    • https://cdn.sqhk.co/baxorurifina/icBjfwe/marvel_comics_movies_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lilapanorup/1gjsIrs/sword_hd_wallpaper_for_desktop.pdfIn PDF document text
    • https://jokisutenewaj.weebly.com/uploads/1/3/1/4/131483229/duwevedexeja-pefumagozaxe-ratenukupewu.pdfIn PDF document text
    • http://astrology-personal.online/waxigobugewudac6r.pdfIn PDF document text
    • https://cdn.sqhk.co/xiroxozalal/6wjzVig/crackle_paint_finish_with_elmer_s_glue.pdfIn PDF document text
    • https://valuluxunu.weebly.com/uploads/1/3/2/7/132710491/tukufedatejiwogon.pdfIn PDF document text
    • https://cdn.sqhk.co/xifobariw/ieNiehg/island_wars_2_christmas_edition_full_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/dibPpqY/nintendo_switch_online_code_free.pdfIn PDF document text
    • https://zagemixawidi.weebly.com/uploads/1/3/1/3/131378918/7706753.pdfIn PDF document text
    • http://pr-bux.online/employment_agency_agreement_template_freeg2ps1.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/hbpVMG8/lego_star_wars_tfa_niima_outpost.pdfIn PDF document text
    • https://vixadabunukup.weebly.com/uploads/1/3/4/9/134902839/bazaxolunadolup-karon-tadenopisufote-kuwifozaxum.pdfIn PDF document text
    • https://cdn.sqhk.co/gutejalajige/aibGgfo/immortal_destiny_booster_box_card_list.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/vewudurufuwovumulapu.pdfIn PDF document text
    • https://cdn.sqhk.co/fekigimuzib/1ifhiJG/army_toys_town_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/gdhf6je/55172078939.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/minijeketidul-nugususiragudoz-furajido-rukivove.pdfIn PDF document text
    • https://nejajabowiwuxo.weebly.com/uploads/1/3/0/7/130775705/48d8fa9c.pdfIn PDF document text
    • https://piwomokoxik.weebly.com/uploads/1/3/5/3/135335333/texogasen_zilogibiviferag_torirepip.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/qIAjaBN/mukevetimagekugivuxaxow.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_off0000f60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60F 5500 bytes
SHA-256: 9a601f47ca52956726548dd870a67fb501dd9fd9addb2cf9465e89e6fc23cb19
font_01_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 11000 bytes
SHA-256: 6892b1d1ce842fa70d41c39a991161067984bd059fe4c06afce0205d3407a865