Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c80b6239444c82…

MALICIOUS

PDF

79.9 KB Created: 2021-04-01 18:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4258529a2b21205844eecfc7eebfdc8c SHA-1: b1917bbab56fc3161e8e1f73ebef4da9e8f63a65 SHA-256: 99c80b6239444c82f9a859705491977dca6a4e9ef07d0c3183a43ccf0eb1a2c3
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to search queries, directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://gimoguvi.ru/wix?keyword=94+cooking+terms+answers PDF link annotation
    • http://lifeshop.pro/lifetime_54_in-ground_crank_basketball_hoop_reviewsm3jlu.pdfIn PDF document text
    • http://reznitskygallery.com/lavepijijopuganijgcn0j.pdfIn PDF document text
    • http://wirelessinfo.ru/what_16_personality_types_are_compatiblerk2cq.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/bogal87tyw.pdfIn PDF document text
    • http://fujigukatujewu.medianewsonline.com/aristotle_onassis_biography.pdfIn PDF document text
    • https://tekovidekugowi.weebly.com/uploads/1/3/5/3/135315876/lideziroxe-buvezupigeneno.pdfIn PDF document text
    • http://thelandofbadideas.com/english_learning_course_online_in_hindiymu9c.pdfIn PDF document text
    • http://flathead.us/nonovakamoxqd2to.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/pulezopefolojofivatura.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/6444791.pdfIn PDF document text
    • http://nazhivy.net/how_to_clean_stir_crazy_popcorn_popperjtlp1.pdfIn PDF document text
    • https://kiruxujekan.weebly.com/uploads/1/3/2/7/132740547/viruwo-newiv-lisofi-jonobekulajimu.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/1st_grade_free_printable_word_search.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/zokaxipomomudubote.pdfIn PDF document text
    • http://silver35.ru/3044268378339ws6.pdfIn PDF document text
    • http://filozajerezabi.getenjoyment.net/nozasuroritikuv.pdfIn PDF document text
    • http://you-bestshop.xyz/java_mvc_tutorial_pointjsa90.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/bonixa.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/zipuperavuvafu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naxesabefadufu.atwebpages.com/bellman_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dc3458b-9cf5-447b-9f97-6c30c8f9f9ce/saitek_x52_elite_dangerous_profile.pdfIn PDF document text
    • http://bavatesivo.myartsonline.com/recurrent_aphthous_stomatitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae19099-75e0-47df-8896-c552fc4ae7d8/how_to_replace_gas_fireplace_remote_control.pdfIn PDF document text
    • http://namepafubi.atwebpages.com/liber_catulliano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e274a03c-fa3e-43e7-ae62-344bb52baf3f/focusrite_scarlett_2i4_software_mac.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/metabolism_of_proteins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dcde7e8-e051-4d29-9936-87e4f249f44f/bavuzejevavatodanaxudip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2773dcb7-24b0-4f09-a99b-6bffefdda164/john_dies_at_the_end_book_summary.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_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 5392 bytes
SHA-256: df3dabaab249761a5b4efaeab8f031554c44edc24f6cd1578e05f7386fbc72da
font_01_sfnt_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 10792 bytes
SHA-256: 68edc006221645c7d3356e9dd681eebf289802b3d93dc690d9a721579d73d1a8
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0