Malicious PDF — malware analysis report

Static analysis result for SHA-256 71bee29bc7c82ab6…

MALICIOUS

PDF

81.6 KB Created: 2021-03-28 14:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 041a942298a0d1745e71bac1a0dcb912 SHA-1: b1ac43b8cc2a245ed9d36c8af34d4823e6e5f72c SHA-256: 71bee29bc7c82ab655834fca0f2c3889d4b5495b8e1f80abe963016510a6f74f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/123?utm_term=mathematics+10+textbook+pdf PDF link annotation
    • https://cdn.sqhk.co/tobijoge/6Dawhj4/lenovo_support_number_canada.pdfIn PDF document text
    • http://dikagowoxi.sportsontheweb.net/abscesso_cerebral.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/vigije.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzinipaz/bcTFDih/3d_car_wallpaper_hd_1080p_free_download.pdfIn PDF document text
    • http://sewototenovaro.iblogger.org/online_html_coding_platform.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/en5mhgd/star_wars_mandalorian_cast_episode_4.pdfIn PDF document text
    • http://pewodebepefawi.scienceontheweb.net/learn_english_sentence_structure.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/djcoihs/alibuy_best_deals_coupons_new_coupon.pdfIn PDF document text
    • http://posadukik.getenjoyment.net/ibm_app_connect_enterprise_v11.pdfIn PDF document text
    • http://rosipale.scienceontheweb.net/cosmic_energy_healing.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
    • http://xerefigirusew.epizy.com/advantages_and_disadvantages_of_mobile_phones.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/41631409434.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_long_do_i_need_to_prepare_for_the_gmat.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/kizebomorokupatowo.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/67890441688.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bf0776a-5ec2-47b6-abef-548deb169691/lawigabaja.pdfIn PDF document text
    • http://jajojamoxarug.epizy.com/5344857489.pdfIn PDF document text
    • http://mowobamalopun.epizy.com/sizivine.pdfIn PDF document text
    • http://godexoba.rf.gd/towopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba62874c-ca98-4a6b-8ccc-e0ee9799d816/jarorisudefeled.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 5420 bytes
SHA-256: 33f0559328ff74f97da82565784138b4f82ab8a5bbe5ee3e260d3a34a25a9937
font_01_sfnt_off0001065a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 10752 bytes
SHA-256: db2575da65fcf76476b70d2fa639d3f213531cdd378c0091c42a2c8f670b9a05
font_02_sfnt_off00012b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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