Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6d7060492c02bc…

MALICIOUS

PDF

94.4 KB Created: 2021-03-10 14:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3df4726b987de4706bc7514c0cee6d07 SHA-1: d4367e7dbbcbbd1dc6caf194e931b6203bf6da10 SHA-256: 3e6d7060492c02bcc4575a9757e58278365c1a16cf0dfb8d486bba76cc725b77
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked URLs. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was programmatically generated.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://xajibur.ru/award?keyword=assam+tet+free+guide+book+pdf+download PDF link annotation
    • http://hargotel.xyz/how_to_write_a_letter_to_the_parole_board_sample_support_letterwkjhu.pdfIn PDF document text
    • http://uaregroup.com/260209961701i4ll.pdfIn PDF document text
    • http://pedalini.club/wumugogexuzariw4ts0.pdfIn PDF document text
    • http://japancar-sib.ru/40148627438zi3jc.pdfIn PDF document text
    • http://popularchoice.space/rent_assistance_form_centrelink_qldu3ndb.pdfIn PDF document text
    • http://goodsun.space/first_grade_math_problemsmaf6k.pdfIn PDF document text
    • http://topuniversityru.fun/economics_for_dummies_free0avr8.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://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b25f086-e5ec-4071-83dd-27484c5773ef/can_i_use_zoom_on_my_echo_show.pdfIn PDF document text
    • https://38aad9b5-7a72-45b8-ac81-9fe73ce82000.filesusr.com/ugd/08338c_85a52d23dc1f41cebe73677d87e3da69.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_baec4857db004d39a5ae496c1aa9a4db.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed443e00-686c-4970-b76f-4f1971b84ddf/sig_sauer_p226r_40_sw_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2314af76-c6ce-4dd9-9c44-abb43cdf705e/basic_geometry_worksheets_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/hey_brother_hey_sister_english_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/alpine_ktp-445_power_pack.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/wizanasatabutax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c5752a-49c5-4e3b-aded-89c9dd121147/6435985619.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f574652-2402-4252-90e5-e00e2cf42909/maze_runner_part_4_release_date.pdfIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_978d1a720d6746ae96aa2454884a4147.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zinudipir/logitech_saitek_x52_pro_flight_control_system_joystick.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/quality_assurance_engineer_resume.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 5528 bytes
SHA-256: 8194d4d5bebdcc808baef0e1b4fcef402a7fe39ad575ef7c1eb37d6755918a03
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off000113de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DE 13940 bytes
SHA-256: af0edda155801557fc94367205ff701c9d85dacc3862377797d40140a37b12b2
font_03_sfnt_off00013f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_04_sfnt_off00014d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8D 9280 bytes
SHA-256: e4891cd2ef4aad06dfbacd45c6045c269dc80b63ccfcecfaa04e188f3230ba6d