Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d84ad8eb18ccf8d…

MALICIOUS

PDF

79.6 KB Created: 2021-04-02 11:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cec931946236e7b4493f96577bf4562c SHA-1: 5cbbe3ffac39bc361f223be1853cf830f92e9a0e SHA-256: 1d84ad8eb18ccf8deb49694ac1acbe638f60dc5f85acac316477d9aa59925532
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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=ubqari+magazine+december+2020+pdf+download PDF link annotation
    • http://on24-system.club/14163693442fclif.pdfIn PDF document text
    • https://miperodijazef.weebly.com/uploads/1/3/4/3/134308013/f2d81c.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/64fba3a50014d.pdfIn PDF document text
    • http://siondez.ru/comentario_biblico_matthew_henry_sin_abreviar_gratis4h78h.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/RsAifQu/eborn_books_sandy.pdfIn PDF document text
    • http://tameenegypt.com/brother_ls_2125_owners_manualve8cq.pdfIn PDF document text
    • http://rezonansmusic.com/fiwanu32cjx.pdfIn PDF document text
    • http://kinoxca.xyz/finnegans_wake_winston_salemmgtf6.pdfIn PDF document text
    • https://cdn.sqhk.co/dapalufited/RihRifD/answering_the_phone_in_italian.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/cd6298b1a309.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/i4ifzhb/lefivoki.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/j8jbPgf/western_cowboy_gun_fight_game.pdfIn PDF document text
    • https://xoforovujedopod.weebly.com/uploads/1/3/4/5/134587448/7615040.pdfIn PDF document text
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/3738d785b.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/05igeZ6/new_horizons_classes_michigan.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/e86cbc88-7dd2-49ca-8815-f00a1e1acd95/how_to_stop_smoke_alarm_beeping_after_changing_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49cbc52a-6396-4dd4-a545-1c4bba5ba2b7/12667498580.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b928297-54d6-4556-90bf-8a38a64b524d/do_exercises_for_scoliosis_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/036153a7-1cc0-4308-9288-775d799b2e45/attack_on_titan_-_animation_movie_season_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a3e6d8-4cab-4eff-bda8-015cb16d0abb/chick_fil_a_salad_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/binh_php_tn_t_v_36_mu_k_tp_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d26f54-cb61-4df1-8c15-df5dbd5023eb/how_to_cook_frozen_spiral_ham_in_instant_pot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5857f44-cee1-4fe9-a6c3-7cfd2d683f1a/wefudig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c95ffcb-9bdb-4d23-adb7-12c508306770/attack_on_titan_season_4_netflix_release_time.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/gozumofaler.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 5968 bytes
SHA-256: 69ca0565304122a3efbe59a9563e4e8c3479ddcefda86575f70efaad59243092
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 11404 bytes
SHA-256: 8e7bc5d74465bd25ae73cf06ec4bb5e30c2a06ac31188bd76da3c8c75edba95e
font_02_sfnt_off00011340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11340 17924 bytes
SHA-256: ec2fb2cf740ba62de996c243fcbfcde5c807a44bc492cad3c84304b37da231b4