Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fa35900fdfeee3…

MALICIOUS

PDF

119.7 KB Created: 2021-03-11 15:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ca6713a77abf92d8cdd0a5594cf6fd5d SHA-1: e149e75c5a44f616152f5af35a7ab99a1423a6bf SHA-256: d5fa35900fdfeee37ed899523ab099c900d342202d8ab05b85575f9344668238
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=tutorial+microsoft+excel+2020+pdf+bahasa+indonesia PDF link annotation
    • http://best-ital.fun/22817006815re4y5.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/c7nkgcF/axis_camera_station.pdfIn PDF document text
    • https://cdn.sqhk.co/jizuxadif/DYifzjb/blank_december_2020_calendar_template.pdfIn PDF document text
    • http://dalkomis.website/antebellum_education_reform_goalsxm2w1.pdfIn PDF document text
    • http://vovality.club/necchi_sewing_machine_repairs__servicevrnji.pdfIn PDF document text
    • http://texno3ua.com/c_language_operators_in_hindi7cyav.pdfIn PDF document text
    • http://delinapod.mypressonline.com/how_to_write_a_community_needs_assessment.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/nopupuvukirapofideraw.pdfIn PDF document text
    • http://donbetosstreettacos.com/wolfgang_puck_pressure_oven_user_manualbolrd.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/EBhdifp/monster_avatar_factory_monster_avatar_dress_up_games.pdfIn PDF document text
    • http://nnorm-id.com/jitiwojung5wnp.pdfIn PDF document text
    • http://1-bog.ru/61416459581kplt4.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/how_to_turn_up_volume_on_doro_phonebye2e.pdfIn PDF document text
    • http://uscreditcheck.info/nusokoex86u.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/SPjbhcz/43587189499.pdfIn PDF document text
    • http://reform-st.ru/5357739574duqjv.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/0ee3b767-01eb-410d-b1de-c4aa3aa9560e/lidatel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd4cddc-886c-4db6-8657-ffd45f090cbc/live_stock_market_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec72838c-81cf-4c20-8383-8dc34967edf6/if_the_moon_is_full_today_what_phase_do_you_expect_it_to_be_at_in_a_week.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/melumis.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/esmo_guidelines_multiple_myeloma_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c3f791-37ce-4cb5-a81d-48fa3bf06e39/97378991910.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/friendship_status_tamil_share_chat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dfdc9f3-9b21-4cec-a4cd-93d8850e78cf/hp_3210_no_scan_options.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_off000196b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B2 5828 bytes
SHA-256: b0e749fd25e394339f78cb4e675c155b063e6832e6aa8734149ab41fcc7aaf91
font_01_sfnt_off0001aa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA52 11280 bytes
SHA-256: 670ff08c3fe5c511816f8006f2be9edcc25b4d718b5c9c08f4894a0a689dfb0c