Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57243b3ad73bbc0…

MALICIOUS

PDF

103.9 KB Created: 2021-03-04 19:59:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c1871487b2c1fd8c14ad224d64244bbe SHA-1: 10754a147a4792de400be6e9fcd5398335c9d09a SHA-256: e57243b3ad73bbc012d262a67daae6e375d2a58c5e2f40217fdc98efffbddd5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9995

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://xajibur.ru/123?utm_term=is+acca+recognized+in+usa PDF link annotation
    • http://psylath.com/gijindwkdj.pdfIn PDF document text
    • http://jebewif.22web.org/66369478264.pdfIn PDF document text
    • http://wide-mean.top/lies_of_locke_lamora_hardbackj464q.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/dunakotawumorega.pdfIn PDF document text
    • http://stat-index-co.com/fikalapomijolawijigaji2tuir.pdfIn PDF document text
    • http://aov.one/97596405112zircv.pdfIn PDF document text
    • http://kofuxasapaduk.iblogger.org/52608095530.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/zezigumebfp79.pdfIn PDF document text
    • http://huaweistoreukr.xyz/critical_thinking_skills_book451ow.pdfIn PDF document text
    • http://ig-soft-team.com/gubamawubejelomipusakiji6cd7g.pdfIn PDF document text
    • http://bluetea.space/65815326023qbh3d.pdfIn PDF document text
    • http://ig-objectionform.com/runnings_hours_willmar_mnb4mlx.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/how_to_train_your_dragon_4_full_movie_in_english_2020.pdfIn PDF document text
    • http://xsale.trade/sheikh_albani3fe5b.pdfIn PDF document text
    • http://smcjd.com/hyphen_and_dash_worksheets_with_answerst3tal.pdfIn PDF document text
    • http://goldstein.berlin/what_day_does_walmart_restock_baseball_cardsfavmn.pdfIn PDF document text
    • http://123dutch.com/doboxokqu0xm.pdfIn PDF document text
    • http://raicen.com/variable_costing_unit_product_cost_calculatorx65fw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://likifodafiduno.epizy.com/4169520895.pdfIn PDF document text
    • http://jokosen.atwebpages.com/gufadisoxexarujizutup.pdfIn PDF document text
    • http://rawupegidozu.rf.gd/mijevete.pdfIn PDF document text
    • http://roveramo.atwebpages.com/21929665551.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_off0001422d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422D 5060 bytes
SHA-256: 9843bf1209b5fa3ad099711d640cfa997ce603fac21e708928a87c0b341a95fa
font_01_sfnt_off00015378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15378 10556 bytes
SHA-256: 1caccdc8d73fce96dfcce850293f6af8d21444f9d6ac1436ed89874d024f4e24
font_02_sfnt_off000177a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A6 17588 bytes
SHA-256: 792732ac56dfbf043c9514fe84fb8ac5ff3292f26c50cd1493ae08dcf5ca1ecf