Malicious PDF — malware analysis report

Static analysis result for SHA-256 b818200522c6890a…

MALICIOUS

PDF

71.0 KB Created: 2021-03-09 10:00:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab8d2298029466bad6c872eb4ceebe20 SHA-1: 54d892194db7b8522afc0c4be69b741b1fc28b01 SHA-256: b818200522c6890a579b5b54d92d3e42bd8085a36edbabe0c7af0d081699e0a1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/aws?utm_term=what+is+h%2526m+style PDF link annotation
    • https://nowagomasililub.weebly.com/uploads/1/3/0/7/130775830/kukijekobizazasin.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/205098352716g4c9.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/3072403.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/jhjnyJx/nukodadadaniwunupizexunu.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/Qjqiiig/birokozedibi.pdfIn PDF document text
    • http://gravkamen.ru/xowopenevewenamizerp6v.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/ijcjfhg/gmail_log_into_different_account.pdfIn PDF document text
    • http://importants.space/mekefiwotapirolijezorebsbbkn.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/ugccLhd/tuzagiwurukepikepagenolo.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/zibid-dibunebumexidev.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/lowamonukewofizimi.pdfIn PDF document text
    • https://wumifidadorubip.weebly.com/uploads/1/3/5/2/135298964/2427992.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/xCiaVij/gitamozaxirisogo.pdfIn PDF document text
    • http://coolvdomaion.online/mosivixodoziws7mi.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/fMghgij/dark_wolf_wallpapers_for_android.pdfIn PDF document text
    • http://mif-smeh.space/57782627724rdh5e.pdfIn PDF document text
    • http://teksalon.xyz/youtube_how_to_use_ez_bow_makerob68a.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/Q8SDhaa/71174543802.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/iejf0Kx/birthday_cake_pic_with_name_and_song.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/SWrLOgc/lamoledoposenaka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee825e4-3670-4db6-95e9-564c731ff7c8/bopajoxojuzibetafadur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7a541b-cac3-48e6-8880-63ce9cbf81f4/87504292451.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f403c266-f37d-467f-be55-02ed92143700/guwuvafidomezazimosuvo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e55b9f9-94a1-4528-8023-22972077ffa9/5660088812.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f8c8012-77cf-4fd6-83a6-efec4fb0b06a/dinikivilofifivefimafun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 4656 bytes
SHA-256: b163170844271c613957749d10198a45828170e56afeea0eb718f24b1fa502e5
font_01_sfnt_off0000ea38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA38 10752 bytes
SHA-256: 412bafefd210a44e5c8311da70c7b5cfc20801de53295042bcfafa63bf05f104