Malicious PDF — malware analysis report

Static analysis result for SHA-256 a69d6768e8aaad7f…

MALICIOUS

PDF

90.5 KB Created: 2021-03-31 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 3482c088358443726d5c26bd2399fce4 SHA-1: 6732a080645d59180ac22446abc37d3a0f9971f1 SHA-256: a69d6768e8aaad7fe6f8219f214f7692755297573411b091128b47c20fe9a21f
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'jacksth.ru', suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jacksth.ru/award?keyword=advanced+trauma+life+support+pdf+10th+edition PDF link annotation
    • http://jonipifenukiz.mygamesonline.org/archery_gb_handicap_tables.pdfIn PDF document text
    • https://cdn.sqhk.co/niririga/jbbOgcv/tow_bar_hitch_adapter_extension.pdfIn PDF document text
    • https://cdn.sqhk.co/wolanojijen/Whba2gg/othello_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_602739ed9ec47.pdfIn PDF document text
    • http://carishr.com/the_maze_runner_1_full_movie_in_hindi_download_480p_filmywapu006w.pdfIn PDF document text
    • http://dfds.in/pathfinder_npc_codex55ygy.pdfIn PDF document text
    • http://loziwazekon.medianewsonline.com/16504794772.pdfIn PDF document text
    • http://alkim.xyz/is_hamlet_really_mad_quotesjywlt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495251/normal_5fe60e74142e6.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/ihjcJpa/38300652782.pdfIn PDF document text
    • http://fakosujonipej.iblogger.org/domain_and_range_of_piecewise_functions_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/wexunaveb/1gdjjgi/godusotajibegij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5ff6ae5a1a6ca.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/8161888185.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/ways_to_feel_better_after_overeating.pdfIn PDF document text
    • http://wofeboz.66ghz.com/chicago_manual_of_style_sample_annotated_bibliography.pdfIn PDF document text
    • http://vitezozikupu.iblogger.org/noxotekufinisokot.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/understanding_china_s_belt_and_road_initiative.pdfIn PDF document text
    • http://womovenum.sportsontheweb.net/87984063566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_6014ea5f5c538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_6041f322863e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofaxafogi.myartsonline.com/design_of_vertical_axis_wind_turbine.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/public_policy_in_australia_theory_and_practice.pdfIn PDF document text
    • http://nukivamo.myartsonline.com/hunger_games_catching_fire_cast_imdb.pdfIn PDF document text
    • http://lugirike.epizy.com/litevopezetivuredutod.pdfIn PDF document text
    • http://rodisasedozax.myartsonline.com/cuadro_comparativo_del_capitalismo_y_socialismo.pdfIn PDF document text
    • http://movetodosewa.rf.gd/centos_6_commands_list.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_off0001211c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211C 5636 bytes
SHA-256: aa5a66611c5f142b069b7f7cc1177a6cb67f2c3d2e0bc2f26b7802b01c172384
font_01_sfnt_off0001342c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 11064 bytes
SHA-256: 89062634e2b4a4c23e3d35bb7bbcb1c465467d1932b85dc3b6964ceab68b9196