Malicious PDF — malware analysis report

Static analysis result for SHA-256 801165dac0515980…

MALICIOUS

PDF

76.6 KB Created: 2021-03-31 12:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3e85d3a0a4cc5217999f5efaf5318927 SHA-1: ebe3f59d41b47f812c5b3418f54880546c343595 SHA-256: 801165dac0515980ee5c2a907cae386513ef591170cf90b97960dd485ddbc5e1
134 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking links. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=samuele+bacchiocchi+pdf PDF link annotation
    • https://cdn.sqhk.co/bijininabex/ieieie1/division_worksheet_with_remainders_year_3.pdfIn PDF document text
    • https://sevezumu.weebly.com/uploads/1/3/2/7/132710575/62552f3e.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/jihIjcj/tukalimunenuwikoneku.pdfIn PDF document text
    • https://liberiloro.weebly.com/uploads/1/3/4/5/134589576/cd3076bdf.pdfIn PDF document text
    • http://popijizixoxovoj.iblogger.org/issuu_downloader_robson.pdfIn PDF document text
    • https://xogosikeduvad.weebly.com/uploads/1/3/4/6/134669078/xesadip-masuwatixel-mawanowa-volasuratogowup.pdfIn PDF document text
    • https://koworuvixoduto.weebly.com/uploads/1/3/4/3/134352933/xetelulezivusiz_jatujirafunik_pokokuxeroxuruv.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/gcBBJji/steam_table_in_si_units_free_download.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/visuwaba_vepakokerakabo.pdfIn PDF document text
    • https://cdn.sqhk.co/timugulirebu/hdgdhjY/word_cookies_macadamia_special_level_advice.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_fb1a67bbf85b445da534e73f8d64a267.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/english_food_vocabulary_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/38621319242.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/chhota_bheem_images_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/banded_knob_tailed_gecko_care_sheet.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_3ce6dc6c751f4f359137e205482ce762.pdf?index=trueIn PDF document text
    • http://wekolutunumoze.rf.gd/schwinn_m717_170_upright_exercise_bike_reviews.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_d93558da58514107b937891c9e9b9de9.pdf?index=trueIn PDF document text
    • https://15e12281-0fef-4bb1-b284-2b61ddec1698.filesusr.com/ugd/6c5390_a87fb2c265a74dad90f7cac7846accbb.pdf?index=trueIn PDF document text
    • https://1e438cd7-6f3b-42ac-a97b-d13a75fa135b.filesusr.com/ugd/0c268c_660b5bc2a38d4bbcbede9297b038a5b4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/61326381283.pdfIn PDF document text
    • http://japipufokaxope.rf.gd/instrumen_lagu_budi_doremi_12345.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 5364 bytes
SHA-256: be3bcb8ec32ee6fbe9c9ff41ed3d56d252e3aa4093608086e3224ea9b38d4411
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 12796 bytes
SHA-256: 2181440763ebe6d4a1df46edf5533c0b6192430e8b5ef5c29e72c3e349240303