Malicious PDF — malware analysis report

Static analysis result for SHA-256 b639dd2070495fee…

MALICIOUS

PDF

87.3 KB Created: 2021-03-17 19:58:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4cc4741693acaaa728aab3e621ee219d SHA-1: da7b64eaecfd247215851066635d1b16fdf20fa8 SHA-256: b639dd2070495fee195438fe41ad2d55cef41ff65828e07817ff13b0925b1183
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains numerous external URIs, including a suspicious one hosted on xezojetit.ru, suggesting it's part of a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, contains fragments that hint at a 'buying guide' lure, aligning with the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://xezojetit.ru/123?utm_term=tvr+s3+buying+guide PDF link annotation
    • https://cdn.sqhk.co/zubavagi/6IigiY1/5577647455.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/begijapogoxegetirididufem.pdfIn PDF document text
    • http://ponemofetu.scienceontheweb.net/xidoxetubusowupezep.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/format_json_file_pycharm.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/0dgfjeP/cordially_invited_zoe_sugg.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/hcgjiZi/cat_pinata_halloween_costume.pdfIn PDF document text
    • http://lumejaramelu.mygamesonline.org/38064757012.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/descargar_musica_anthony_santo_en_vivo.pdfIn PDF document text
    • http://gewarum.66ghz.com/white_and_blue_background_images.pdfIn PDF document text
    • https://cdn.sqhk.co/mibaforetu/agdhfgh/41795418484.pdfIn PDF document text
    • http://togoxuruk.22web.org/jakopibakogepafunovevafi.pdfIn PDF document text
    • http://sadinexiwa.mygamesonline.org/43726865307.pdfIn PDF document text
    • http://fubawubu.22web.org/welelubizofekogidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_49a8142b822d41aa97d1e6540f10215a.pdf?index=trueIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_0f92828e426945b8bb2d6467c555e3b9.pdf?index=trueIn PDF document text
    • http://riberudedanute.epizy.com/40772556970.pdfIn PDF document text
    • https://e4da1597-3bb3-488b-9226-7c2c9e06e9ce.filesusr.com/ugd/db5d73_4428fbc675fd480694eb29141b6751e2.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_288cf8a4de7f4ef584b8d917cb5bb181.pdf?index=trueIn PDF document text
    • http://xetibewiz.rf.gd/11929875488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c0a7b8-a1e7-474e-aa12-9d231fc57041/hotpoint_gas_cooker_grill_not_working.pdfIn PDF document text
    • http://rekuzek.epizy.com/what_is_e1_error_in_voltas_ac.pdfIn PDF document text
    • http://todubina.epizy.com/hello_brother_film_song_webmusic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0a6394-879d-4ccd-9fd7-db11406865c0/95733807686.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dad7bc8-e348-4b1f-8385-5dddd5966793/modadexususajobuluxalof.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_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 5168 bytes
SHA-256: 865922c1126e781c2ddba4038cc3bdd13c6ff3a23e81dbbd6f125eb4b0f4af3e
font_01_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 11192 bytes
SHA-256: 0b7640df65420c6953385c4a0fda3f0379e2712f0acd9be1051c8fd7462d2192