Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a31531bcf6a01a3…

MALICIOUS

PDF

67.3 KB Created: 2021-03-30 22:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 436ecb8e8b61cd95b68097a4e5ce7bee SHA-1: c52c7ef55db21e002b74c45517e5d3ce2d482eea SHA-256: 1a31531bcf6a01a3795c9009f0fe0584a3559bd90c71355ccf787da27a6e47cf
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 0.9997

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://lozipotod.ru/123?utm_term=facebook+messenger+lite+2019+apk PDF link annotation
    • http://bigchance.pw/the_speaker_s_handbook_11th_edition_freeyyqtu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503787/normal_5fc608fe71bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_601cc4349b72a.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/78895692055.pdfIn PDF document text
    • http://stickerrus.ru/possessive_pronouns_worksheet_for_grade_3ahh8v.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/black_and_decker_20v_max_cordless_drill_driver.pdfIn PDF document text
    • http://fastpysystem.online/child_education_allowance_new_formatnmlqj.pdfIn PDF document text
    • http://mmmmmme.space/39414956102fo7pm.pdfIn PDF document text
    • http://bet-info.ru/40981412263pkdyv.pdfIn PDF document text
    • http://bomepufibawil.scienceontheweb.net/network_administrator_interview_questions_and_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_5ff8473a73f08.pdfIn PDF document text
    • http://mjawebdesign.net/chopin_24_preludes_best_recordinggu0i6.pdfIn PDF document text
    • http://electriccannoz.club/50002957496i2xb4.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/0fd44f80-6deb-4905-8b4a-51715365a7e8/asus_router_rt-ac68u_b1.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/10359242766.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/64445532129.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/tudixutonepoxuvuzavobij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc15e73e-2d6e-4608-ae01-bb01d0066b9a/manual_curso_primeros_auxilios_basicos_y_rcp.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/66607541686.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/why_wont_my_garage_door_opener_light_turn_off.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/latinoamerica_calle_13_letra.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 5896 bytes
SHA-256: a3ecdae4d221c79674ac287f5a0ceb33b80bc459e73675ffb0736308aff90c81
font_01_sfnt_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 10672 bytes
SHA-256: d50965ec3a13256b4d301b6c110286f905943cb49facb0f6e20cb96d5353519e

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