Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1027ca141eb994…

MALICIOUS

PDF

72.8 KB Created: 2021-03-25 04:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 68d0f91ef81cb0050e6184e00df05aac SHA-1: 0857f1231afee7126efaf8be50a6a7d202034c7b SHA-256: 9b1027ca141eb9944b944df3f288e6205a5bd4076de21a4e67b75c997af209f4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and redirectors, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection further support the malicious nature of this file, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wb?keyword=electrical%20trade%20theory%20n3%20textbook%20pdf%20download In PDF document text
    • https://cdn.sqhk.co/kufagilan/MdhbJhh/25781781097.pdfIn PDF document text
    • http://fastpysystem.online/olympus_om-10_camera2obk4.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/cs0jbf3/19416868165.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_600f82edb5d28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448121/normal_604d73c1b220f.pdfIn PDF document text
    • https://cdn.sqhk.co/fapolokid/hahbihe/redeem_voucher_dunia_games_telkomsel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375087/normal_6057b34daccd7.pdfIn PDF document text
    • http://wukosuwusa.iblogger.org/alchemist_leveling_guide_ragnarok_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_6028ba4635be3.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/O45gjje/zombie_hunter_king_game.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/XIFVF3H/old_tomb_palace_escape_walkthrough_part_2.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxogatuv/ha4cEtO/leap_card_top_up_locations.pdfIn PDF document text
    • http://banki-internetowe.com/fisaseaxvs1.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwatak/qhbgeRY/diamond_bracelet_images.pdfIn PDF document text
    • http://strongcreditscore.info/how_to_set_temperature_on_a_norcold_refrigeratortvkia.pdfIn PDF document text
    • http://smartcoin.design/fun_phrases_to_say_in_japanesek9rnj.pdfIn PDF document text
    • http://pitushok.fun/lofixanutotovabekefaxuna2aplw.pdfIn PDF document text
    • http://itsamorem.com/how_to_calm_down_someone_with_anxiety_attackpmit3.pdfIn PDF document text
    • http://espacecmb.xyz/tumesudujuxijuzufueaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gatezoru/hN9iiwq/tagepidobomifizazuje.pdfIn PDF document text
    • http://demask.space/45867069049qsk10.pdfIn PDF document text
    • http://sodalabs.pro/76040194325t8wzs.pdfIn PDF document text
    • https://cdn.sqhk.co/nelufebo/iA80Bgj/tavoreji.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxogife/euAPBkZ/last_island_of_survival_mod_menu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_60091aa88d576.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://lobulowigewimu.epizy.com/60967326952.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_off0000d14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14A 5440 bytes
SHA-256: a9bf80460bf1629791ae07abc24cca0fe1120f478ae5946ab423d288717176ef
font_01_sfnt_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 10404 bytes
SHA-256: 72ca2e562f4d3b9181d28dbf7cd5b78724c40950a24519aad6a2e136b238c3ec
font_02_sfnt_off00010754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10754 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c