Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bbd7ed2f7bf0f89…

MALICIOUS

PDF

81.5 KB Created: 2021-04-01 15:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 852b91f29c7abd825e33a1a4d7ef1c6d SHA-1: 6b83c332cfe952f20f2ee81f97e208f4b894703e SHA-256: 6bbd7ed2f7bf0f893cdcc31157030dca7ad75168c6e4648d8d6181928874f962
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs, with one pointing to 'zajinet.ru', indicating a potential phishing or malware distribution lure. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further suggests this is a link farm hosted on disposable domains, a common tactic for malicious sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of multiple external links strongly suggests an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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/123?utm_term=basic+instinct+movie+full PDF link annotation
    • https://guzaluvezitalil.weebly.com/uploads/1/3/4/6/134645516/6956800.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/xhjjCha/40723519216.pdfIn PDF document text
    • http://websporizle3.com/899584032g69r4.pdfIn PDF document text
    • https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/8dae62898.pdfIn PDF document text
    • http://gedozudusinap.mygamesonline.org/calendar_template_blank.pdfIn PDF document text
    • https://cdn.sqhk.co/bibikodazit/ggegf2i/febawezufujijaxajuneni.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/1860095.pdfIn PDF document text
    • https://cdn.sqhk.co/lomokubaf/jcCIMij/education_website_templates_html5.pdfIn PDF document text
    • http://skameyki.club/write_text_on_adobe_reader2vpek.pdfIn PDF document text
    • https://davokirik.weebly.com/uploads/1/3/0/7/130739121/vokovusowu-xowerokivum.pdfIn PDF document text
    • https://cdn.sqhk.co/balemarize/ghgdwgc/contract_sniper_assassin_3d_gun_shooting_games_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_605b6a7b8e76f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_602562cf3719b.pdfIn PDF document text
    • https://cdn.sqhk.co/zaxuloxedu/jgdr7hf/auto_reply_outlook_app_ios.pdfIn PDF document text
    • http://epaytds.xyz/what_can_you_eat_while_doing_a_colon_cleansergnt0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5fd60c95ecba1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501656/normal_5fe5ee74ae09c.pdfIn PDF document text
    • http://nofubajabuv.medianewsonline.com/cracking_the_gre_psychology_subject_test.pdfIn PDF document text
    • http://gachihyper.xyz/poulan_p3314_owners_manualup946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/sta-rite_pump_parts_canada.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/dell_latitude_d830_ram_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/opening_bungou_stray_dogs_season_1.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/top_100_single_charts_deutschland.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_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 5040 bytes
SHA-256: 9244025a83a0f1ead9c7ca91cedf84ad21895962ff328889bc790cb6e24e666b
font_01_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 11376 bytes
SHA-256: ccc727d3302c24518a316e7207d6ae997f77939b70b998055bcab14ab56eb307

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