Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e5533749d92e5b…

MALICIOUS

PDF

83.4 KB Created: 2021-03-30 12:09:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0463c6d9971f6098f40129d2ecc9bb57 SHA-1: 16895cdacb8ed5ccb169589e524f283778765551 SHA-256: 70e5533749d92e5b43f0f72b72533a266b9e0f0f930080de4bfa1a2b5ce95b19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to application forms, reinforcing the lure. No scripts were extracted, but the PDF structure itself likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 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://crophysi.ru/award?keyword=nsfas+application+form+2020+pdf+dut PDF link annotation
    • http://kixurox.getenjoyment.net/yasin_surah_bangla.pdfIn PDF document text
    • http://durebivov.iblogger.org/how_to_analyze_survey_data.pdfIn PDF document text
    • http://fit-italy.space/hpi_baja_5b_spare_partsc7aw8.pdfIn PDF document text
    • http://jovepodixowofow.mygamesonline.org/vuxoruzuzodubuwumazo.pdfIn PDF document text
    • http://zisezamerares.mygamesonline.org/68761675080.pdfIn PDF document text
    • http://cmbclientes.com/80676673482k6z47.pdfIn PDF document text
    • http://abzac.me/49881565240s9plh.pdfIn PDF document text
    • http://snegny.com/managing_complex_change_dr_mary_lippitt1yuyt.pdfIn PDF document text
    • http://vizit.store/dehiscencia_de_heridaok6bt.pdfIn PDF document text
    • http://paselon.getenjoyment.net/muvilixoxupigesiga.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
    • https://uploads.strikinglycdn.com/files/8fa293ee-ae27-490e-b770-441528c291d9/26466273.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/77366671699.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/72987407605.pdfIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_f9ef8f25276844b4939223779b2fbd9f.pdf?index=trueIn PDF document text
    • http://movedubeliw.epizy.com/simple_biodata_format_word_file_free.pdfIn PDF document text
    • http://wagupamodesugub.rf.gd/esl_articles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/animated_emoji_android_github.pdfIn PDF document text
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_56e32735e6414762a4408217cececb21.pdf?index=trueIn PDF document text
    • http://pilezipiluzoso.rf.gd/47756763428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afd1d919-822d-4d10-89ca-c51901abbc77/how_much_does_a_computer_programmer_earn_a_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2435b0b-4c3b-4998-98b8-ef381d2cc505/wouxun_kg_uvd1p_service_manual.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_01eb268d3d26460abb954c83ae17bc82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/gmc_acadia_denali_2015_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2160cf00-e6c7-446f-b97d-ae4b37a00dbd/does_cain_and_abel_have_virus.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/89469611953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eca1756-eb73-4566-aded-01bfb01aaff4/64852608918.pdfIn PDF document text
    • http://vobikeretuwof.atwebpages.com/53760914410.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F4 5308 bytes
SHA-256: 01d38e8d9cdcae59e5913226739ddd2487293b54aeb9414cae921ea9703e5281
font_01_sfnt_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 10940 bytes
SHA-256: c594d6a04ff536c58eaf66f1ec189a4f1c7d1b20202d5d71caff411adfb46d49
font_02_sfnt_off00013117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13117 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176