Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea36fe2e1623ae2e…

MALICIOUS

PDF

75.2 KB Created: 2021-03-16 05:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e87072ddeb5fe67440db3d0e08e9ea47 SHA-1: 51230d61a6f8a6651d96de0f4184a602f8170418 SHA-256: ea36fe2e1623ae2e0250a1eb864c631506be43f9eed7546fc36fb4cbccf2a179
196 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. It uses a LOLBin command-execution lure. 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 0.9992

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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://golowaki.ru/123?utm_term=c+wright+mills+sociological+imagination+pdf PDF link annotation
    • https://zowatiloni.weebly.com/uploads/1/3/0/7/130739934/bobilaxozuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/kosadara/hjbgiCK/2nd_grade_go_math_chapter_5_review_test.pdfIn PDF document text
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/tulipu-xifewisu-tupinasilarunom.pdfIn PDF document text
    • https://cdn.sqhk.co/bikugipozamu/YgjJhaa/call_of_duty_ghosts_xbox_360_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/butaliwe/jb1f1N8/26140941645.pdfIn PDF document text
    • https://kobamaputoruv.weebly.com/uploads/1/3/1/4/131409310/fivozunixewu.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/oif5Mgd/std_10_textbook_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/hj9igwL/wallpaper_4k_pc_1920x1080_gaming.pdfIn PDF document text
    • https://cdn.sqhk.co/zapusukajev/ghhgd8y/46440896398.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/metobeg.pdfIn PDF document text
    • https://cdn.sqhk.co/nasanoroge/oif5Mgd/std_In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gulapore/42944737466.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/honeywell_vista_20p_programming_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/what_is_a_behavior_intervention_plan_bip.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/84826379571.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/procurement_policies_and_procedures_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/94067697254.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b46b929-4d6a-42fb-aa74-da63d8974f28/how_to_change_a_timex_marathon_watch_from_military_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3b88cb6-ddf4-4a5e-a683-466e31e6f831/how_to_do_an_s_bend_curl_and_cut.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/past_perfect_simple_and_continuous_worksheets.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/fakuguvil/inferring_character_traits_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e294e7-f624-4796-ab14-63531e5707fa/homelite_xl_76_chainsaw_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5d9a40-bc1a-495b-b082-648c1473e238/find_best_flight_deals.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/devonobuwoziranomu.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_off0000e8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 5564 bytes
SHA-256: 47f076028748a672e7c898cf6087f7d05783b0b373597acb9d43dac7cd40be43
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 10412 bytes
SHA-256: b01a37b2ada9df9aab1343a6f0d45bb8f4f39e3e6bb78a48690dba318a33da3d