Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dcd7a38468ec4c5…

MALICIOUS

PDF

77.3 KB Created: 2021-03-31 00:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b7153f1b9b18440e407226f87adfa83 SHA-1: 538e580c52f3f76b30c497883edea8d81ab97bad SHA-256: 9dcd7a38468ec4c5e7dddbc8310a08cd65c855aefca2f990c59738af6cdad951
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=how+to+read+guitar+music+sheets+for+beginners PDF link annotation
    • http://erogan24.website/rational_and_irrational_numbers_worksheet_grade_8j13yl.pdfIn PDF document text
    • http://afracheat2.xyz/7601072874925rkn.pdfIn PDF document text
    • http://liketime.fun/bissell_spot_clean_professionale1wvx.pdfIn PDF document text
    • http://it50disconto.info/how_to_answer_np_interview_questionst8it3.pdfIn PDF document text
    • http://verifedform.com/behringer_xenyx_x2222usb_reviewpmwtp.pdfIn PDF document text
    • http://salopkisa.website/4019061588qr9ya.pdfIn PDF document text
    • http://wiinorama.space/past_tense_worksheet_for_grade_3sw6wp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jonegukum.epizy.com/requisition_form_template_excel_free.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_46002e3f1c024ceda2d2532c8573618a.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_5c247b80ab3640df86fa0be417449470.pdf?index=trueIn PDF document text
    • https://5c54d0bb-9de8-469b-abb1-33232a952ba9.filesusr.com/ugd/370e3f_c1472c2f82b146988b2af0c9db68d4d2.pdf?index=trueIn PDF document text
    • http://mizuselafu.rf.gd/how_to_put_a_cosco_car_seat_cover_back_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb86887c-aaff-4f51-813a-f4f0046436be/why_is_gni_better_than_gdp.pdfIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_dd37690a4e374544a0430efcccffc5e5.pdf?index=trueIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_75c2d4642cbd4690a2bb56557badf807.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/48911c48-eb28-4be7-aa1a-e84bab41ec63/brother_hl-l2380dw_keeps_going_offline.pdfIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_b3cda0c1336d4bffa44c437666eb3a69.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_dd7354a8cc824abca4b9ee76fa8d8015.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_945df2a7c541485287f5712525855e37.pdf?index=trueIn PDF document text
    • http://netomaniw.rf.gd/boblo_boat_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc9ebf5-af3a-4905-ad4e-7fb4a6e7b0ef/89133721392.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_c379e9b42abf45dba56360356aa2cafe.pdf?index=trueIn 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_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 5596 bytes
SHA-256: f7a46ae787d1afc814b8f9846b72b870a332fc0e1fb0f70126ad3faa8784f347
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 11000 bytes
SHA-256: 1c1351538e2b3431ecea1730f530de7ad7760da1814662e96900d129e644fa5e

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