Malicious PDF — malware analysis report

Static analysis result for SHA-256 537609a47ed074aa…

MALICIOUS

PDF

76.1 KB Created: 2021-03-20 08:00:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d0c4db03cbca4928858f45f3149d2ca7 SHA-1: 50ddfdf33fa03e21ba280ac5f91ea753a4792601 SHA-256: 537609a47ed074aa961e2721b2cb50e523b1f7a3b5ce5c88e1b0d5fc08b5f51a
156 Risk Score

Malware Insights

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

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 0.9895

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 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.
  • 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://resalured.ru/strik?utm_term=demon+hunter+dps+rotation+addon PDF link annotation
    • http://businessoutsourcing.info/colorectal_cancer_screening_canada_guidelinesu46sp.pdfIn PDF document text
    • http://sosibaserud.22web.org/msi_970a_g46_bios_reset.pdfIn PDF document text
    • http://dressnbuy.com/xunasanifaduwuwarakg0r08.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/xixejimin.pdfIn PDF document text
    • http://thechambre.xyz/dell_inspiron_3847_maximum_memoryh98bc.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/66282150505.pdfIn PDF document text
    • http://erethiztzj.space/gba_emulator_iphone_20209eaur.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/dr_brown_microwave_steriliser_dimensions.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://s3.amazonaws.com/muxegeza/segafogugilax.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/what_does_the_american_constitution_say_about_equality.pdfIn PDF document text
    • http://dasufolizimifub.rf.gd/bestiario_medieval_ilustrado.pdfIn PDF document text
    • http://zobotipuzadevi.epizy.com/83494039010.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_cab6cad8f6964f958d8b1dbc5c1fd0e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/2011_honda_pilot_repair_manual.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_830fea7f196741d2aecbbe442dc5a6ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/xaravoboduvaluxadenase.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/private_candidate_application_form_2019.pdfIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_1e6e0a128db049d8948f51ae2936717a.pdf?index=trueIn PDF document text
    • https://7a6021ad-ea99-40b3-bafb-6570e045b460.filesusr.com/ugd/527ec5_6b50f9b2afc4440a9d31894ab1821271.pdf?index=trueIn PDF document text
    • http://keluwuvofaj.epizy.com/score_match_hacked_version.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/cannibal_ferox_1981_movie_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/40728626715.pdfIn PDF document text
    • http://pekafujojef.onlinewebshop.net/the_48_laws_of_power_by_robert_greene_animated_book_summary_-_all_laws_explained.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/nalafe.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_d7c3e2640a4145dfab6bc5040c8b024b.pdf?index=trueIn PDF document text
    • http://danasavej.epizy.com/application_of_complex_numbers_in_computer_science.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 5048 bytes
SHA-256: 80631c3d016f0ca6226bd9dbc95bcee623520b4087e9f155b5a65447182250a6
font_01_sfnt_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 10480 bytes
SHA-256: d200032c6b701e7ba760cbe66be4f835fdeb523048c59a6166e0df12a1a761a1
font_03_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361