Malicious PDF — malware analysis report

Static analysis result for SHA-256 b852b5a70d626c3b…

MALICIOUS

PDF

73.3 KB Created: 2021-04-02 01:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 13dde459bd7c21aee46e66bbbfbcda26 SHA-1: 50bd80eb570c23ea40567e2cf45f4a6b0352c4d8 SHA-256: b852b5a70d626c3b0f37255771481d26eeb417b397c461e779ba4edd06c76449
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://resalured.ru/wix?keyword=elsa+hairstyle+tutorial PDF link annotation
    • https://vagobodowi.weebly.com/uploads/1/3/4/6/134600101/1f20f7179.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujonad/o0ShbDG/chocolate_recipe_without_coconut_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/vatomepipiw/ijUibhj/62391374886.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/Wkjgdhj/unlimited_speed_mod_apk_unlimited_money_and_gems.pdfIn PDF document text
    • http://it50discount.pro/venous_blood_collectionrfff6.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/iajcUjh/jump_on_it_dance_in_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/gjhbibI/idle_heroes_e5_xia.pdfIn PDF document text
    • https://cdn.sqhk.co/bupitagalir/hcgftic/dragon_ball_z_xenoverse_mod_ppsspp_download.pdfIn PDF document text
    • https://pemilelolobuwi.weebly.com/uploads/1/3/4/8/134881311/parigagetizuvulin.pdfIn PDF document text
    • https://cdn.sqhk.co/wagejino/frFlOwd/donewefasulapezivef.pdfIn PDF document text
    • https://betewobinolatid.weebly.com/uploads/1/3/4/7/134756009/bijifokipine_samomozokumolub_fasane_lawogasafosoru.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/ghJiege/samatawemiluzux.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/iemqEhe/mortal_kombat_x_cheats_ps4_unlock_all_characters.pdfIn PDF document text
    • http://gisisavodure.22web.org/83990285686.pdfIn PDF document text
    • http://yandex-delivery.cc/fekovapuwakixadifozov96msi.pdfIn PDF document text
    • http://fabulouss.space/549630090355l2bt.pdfIn PDF document text
    • http://copyrighthelpptteam.com/wamapudozaromakt5q5.pdfIn PDF document text
    • http://rozel.ru/4362310522fnuzf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd37f9b7-1657-49a3-8d5a-473967876dbc/mathematica_group_theory_book.pdfIn PDF document text
    • http://toguzojokes.epizy.com/kerepojogumebawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aca4daba-8911-4567-acde-66a29fba9eeb/build_my_life_guitar_chords_key_of_d.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_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 4832 bytes
SHA-256: abda4c028292262a63f6a47ce320966a472ad50e4e7b8ea83507ce2f785b72f3
font_01_sfnt_off0000f3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10588 bytes
SHA-256: bfd50d642d8c0a11acc21b2c54c3e69614c5ccd23a1360740662bb8d889d45b4

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