Malicious PDF — malware analysis report

Static analysis result for SHA-256 486b5bcd8c4f5cba…

MALICIOUS

PDF

69.4 KB Created: 2021-02-13 03:25:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: accadd8e5a4028ab55354598971fdeed SHA-1: 518a9b65dae0fcc459f92415d66584070b54e091 SHA-256: 486b5bcd8c4f5cbab23744b2fd1d78684ff343cbb71804f8992a8fe9ca4f6aad
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of embedded URLs, many of which point to disposable domains or redirector infrastructure, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically calls out a link to 'yafferge.ru', suggesting it leads to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=runescape+big+game+hunter In PDF document text
    • http://peludofnor.fun/candy_grand_vita_reviewsn5igu.pdfIn PDF document text
    • http://price-list.moscow/gem_miner_dig_deeper_apkjrg2r.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/boxedewawer_bitinep_botebepasuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424645/normal_602703b2e1951.pdfIn PDF document text
    • http://drnextact.xyz/jaxavapofapafojujafejs3vm.pdfIn PDF document text
    • http://redita.fun/miwibizusorawitefujiduvst8hd.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/5131908.pdfIn PDF document text
    • http://tameenegypt.com/plague_inc_apk_mod_dna_infinito_201996ucw.pdfIn PDF document text
    • http://dnepr24.info/playerpro_music_player_apk_2020v7cqx.pdfIn PDF document text
    • http://ottics.ru/powerful_phrases_for_effective_customer_serviceay6w3.pdfIn PDF document text
    • http://ontrade.top/akka_framework_tutorialmb4z6.pdfIn PDF document text
    • https://jefamozalubibul.weebly.com/uploads/1/3/1/4/131438275/5477738.pdfIn PDF document text
    • https://rixagebama.weebly.com/uploads/1/3/0/7/130738507/5152405.pdfIn PDF document text
    • http://zaliv2k20wowowowoow.xyz/vuguzexoxovud2mm7j.pdfIn PDF document text
    • https://bawosizegidaw.weebly.com/uploads/1/3/1/4/131411147/jikenitavubata_sazob.pdfIn PDF document text
    • http://kapusta.pro/buku_humor_sufinhkey.pdfIn PDF document text
    • http://nikecortez.net/79455224406j3n2a.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/dikobepibelun/stoichiometry_limiting_reactant_problems_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/corrective_action_response_form_template.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/auto_format_dialog_box_in_excel.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_off0000d28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28F 5460 bytes
SHA-256: 48f01bde423ada94a5e86b2b12ea534721b391eca82eae9c59add2c39cd93549
font_01_sfnt_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 10404 bytes
SHA-256: 94ea6000b46b4f5aa742fdb69ee14d2d6fc8b1085fbb7b54866834c0363505e5

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