Malicious PDF — malware analysis report

Static analysis result for SHA-256 f905d9f079dd76c8…

MALICIOUS

PDF

89.8 KB Created: 2021-03-20 11:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 04332889eddce99834e8d9d428862c84 SHA-1: 5b7405f92e2f8eaf1d81b08ceaf9040038d9288a SHA-256: f905d9f079dd76c84412d79186f2dcf7ba563c04ff8a2589b10723aaa50e6433
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 0.9904

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://pelibifir.ru/123?utm_term=good+morning+pics++full+hd PDF link annotation
    • https://cdn.sqhk.co/pulizojiwim/jcrghid/75909874281.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/yrdiilh/best_kylie_minogue_dance_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_604182f1a1570.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_6015304cd262c.pdfIn PDF document text
    • http://bristol-yalta.run/gulobejonajegijfjzvv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460231/normal_604741543a217.pdfIn PDF document text
    • https://cdn.sqhk.co/lexaxemiji/hhiqjFD/90891355846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_6055543341080.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/9heG3wL/speedometer_definition_finance.pdfIn PDF document text
    • https://wozavosasegug.weebly.com/uploads/1/3/4/5/134509229/fomobati.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvuvidova/fgfr5cu/homescapes_mini_game_walkthrough.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/color_combinations_for_tableau_dashboard5xt76.pdfIn PDF document text
    • https://didefoberemi.weebly.com/uploads/1/3/4/8/134879298/82897a9fe58cd6.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/29622759246sfcwm.pdfIn PDF document text
    • https://cdn.sqhk.co/tinulafi/ibMhd34/15878486536.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/wetafuveliwubizatu.pdfIn PDF document text
    • https://bivupexas.weebly.com/uploads/1/3/1/4/131453521/romoz.pdfIn PDF document text
    • http://retys.space/easiest_way_to_make_pop_up_bookrqq63.pdfIn PDF document text
    • https://cdn.sqhk.co/kelanadu/gdiiMge/kijakojimitotovudawosesir.pdfIn PDF document text
    • https://cdn.sqhk.co/nemazuwigumo/Bhvjf9a/baby_bumblebee_kids_songs_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/iiiiii1/battery_operated_candlesticks_halloween.pdfIn PDF document text
    • https://nusevusigafub.weebly.com/uploads/1/3/1/3/131398220/mopovexomexe-xedepuf-favuvixe-nuposonajasuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/mazonixun/jgywBic/cfop_f2l_easy.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/gibgcAu/burger_king_menu_breakfast.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/OWhhLia/zifajamoworubetezivirixe.pdfIn PDF document text
    • http://ourfutures.space/ayurveda_books_freefw3u8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 5392 bytes
SHA-256: 8d5474f0d072d8ca63969ffa2898d8f73796b63010f37b649e5fbb91c0fddb09
font_01_sfnt_off00011ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA4 3652 bytes
SHA-256: edc24869ed6aa22e802ce658748a0b5fee92f062e8e920c9b9555e7416cfa4c2
font_02_sfnt_off000129cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CF 11492 bytes
SHA-256: 2f1a6ad97b337dc10f43244b5c097c10ccf09d8b1d6cf8eaaef13886b0d8cddf
font_03_sfnt_off000150ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CE 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19