Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5dba6f2e03fbfc…

MALICIOUS

PDF

79.1 KB Created: 2021-03-10 05:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 64b7c8d85edec7eb8f9b37dade50de16 SHA-1: 11fd941348fdd8367e9c85263dbf09157acecb59 SHA-256: 4d5dba6f2e03fbfc0bb8bb7d63fc23e873365d5043c5f86100488b5911583cad
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV. It contains numerous external links, including one to 'zajinet.ru', suggesting a phishing or SEO manipulation scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of many external links points to a likely attempt to redirect users to malicious or scam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/award?keyword=william+shakespeare+sonnet+130+pdf PDF link annotation
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/1732517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492580/normal_603e4b831dea1.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/cKLjhid/switchblade_necklace_criminal_minds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_603e27da43565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468267/normal_5ffbe262c6716.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hlO0hhc/funny_hashtag_generator_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwewiwudesi/jf4OXid/30954015807.pdfIn PDF document text
    • https://cdn.sqhk.co/lojeliju/fkjfLie/cnc_lathe_machine_price_in_sri_lanka.pdfIn PDF document text
    • https://cdn.sqhk.co/vapezuwe/fY77Fji/52077255832.pdfIn PDF document text
    • https://cdn.sqhk.co/tugitajusow/eheibji/infection_rate_of_covid_19_by_country.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_6011c81723317.pdfIn PDF document text
    • https://cdn.sqhk.co/pidefatop/ididLhb/xopukexuzipojavifusef.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/ibgfgd9/12729300998.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/ehaQgdq/good_pizza_great_pizza_stewards_challenge_day_57.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/mofowerir-bisejaxezo-lojaxusa-mevigej.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
    • https://uploads.strikinglycdn.com/files/bdc01a41-78cc-4790-a5ba-61e6ada5a5ae/how_to_get_my_ham_radio_license_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e2256c8-eb48-4b45-a7b2-318e32871c7c/harry_potter_5_film_cast.pdfIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_5a6812daccfe483d9ca0669ddbd27df9.pdf?index=trueIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_b85051dcf3a44104b1bccb505399ecae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc354259-5cdf-45a1-8ad3-37608d2c605d/83843056478.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5011975-7559-4507-adf3-857a2de30ac1/their_eyes_were_watching_god_characters_chapter_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c15b406-068b-423c-85db-7384045e4413/felices_dias_tio_sergio_completo.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_49dd57a6427d424ca47ccd1d319b06c5.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_eabcf02f42884d059f4a6315fb840c9b.pdf?index=trueIn 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_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 5504 bytes
SHA-256: d8e8f493f20cc872fa12878f546f483422dd167210aa860449d460604398af4e
font_01_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 10108 bytes
SHA-256: e1ed3899fcbb7111a77cf17f5847be2e7cf54144234eb36a9c610db1c6f444ea
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333