Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd4455f83854f2c…

MALICIOUS

PDF

76.6 KB Created: 2021-03-16 10:27:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f3b6dbdf98346b86338436b72becb184 SHA-1: 63a97bcee0fb338e02c1e2cbd173f9432bf7fdc4 SHA-256: 4dd4455f83854f2c8f2500dd1323b0e93981c068ee5f5208d82938e30fd596bb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://resalured.ru/wix?keyword=shark+classification+worksheet+answers', indicates a potential lure to disguise the malicious intent. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of malicious activity, possibly leading to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://resalured.ru/wix?keyword=shark+classification+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/kitijorawul/jgVhjhj/stickman_shadow_super_saiyan_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/UKgjCeH/pico_superhero_car.pdfIn PDF document text
    • https://vafoguvisijun.weebly.com/uploads/1/3/4/8/134887412/cbd77ad1e7.pdfIn PDF document text
    • https://mibirewisurux.weebly.com/uploads/1/3/5/3/135313447/kininejese_regazo_vawav.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/gLhdice/56873394736.pdfIn PDF document text
    • https://bexenexitefixu.weebly.com/uploads/1/3/4/7/134725849/584972.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/hibhipG/world_building_craft_mod_apk.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/mober.pdfIn PDF document text
    • https://lajizifoposu.weebly.com/uploads/1/3/5/9/135958207/08fb5803e61.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/moto_g_2nd_generation_touch_screen_price.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/1211404336.pdfIn PDF document text
    • http://kimiter.medianewsonline.com/advantages_and_disadvantages_of_globalization_in_africa.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/PheigJm/color_touch_effect_in_android_recyclerview.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/3d71a740-f85a-478f-8b4f-c30b10a767a1/cooks_coffee_maker_12_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/yangzijiang_shipbuilding_annual_report_2019.pdfIn PDF document text
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_d8cfb3b97d0a427fba721de74db5ccfe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/agnyaathavaasi_songs_lyrics.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_6547d9c7727d496b8572842cfc78c83f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xisefowu/vumudopufemoguvix.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_7d47e4ab09504f7cb1dca8dd0673fa7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/why_is_my_gas_oven_not_heating_up.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_0b14a445ff174d319aacaf53b5dfa073.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d75d713-72d2-4ecb-9023-aeb4611a1190/does_figure_8_exercise_work.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 5228 bytes
SHA-256: 9e531a6a8ef77744d5270bf1f5bc8316062f8376a96b028f3c6801fb05e743df
font_01_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 10000 bytes
SHA-256: cd657d76670ed2140492daa2952c3fb02b6279c05acd6b7bd187586bb5674456
font_02_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16160 bytes
SHA-256: b91ebbfc40a94f10b2fcfc4d08542e4cd4fc38dcff43bcfefe5d572695fcce17

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