Malicious PDF — malware analysis report

Static analysis result for SHA-256 a445586615a9a77a…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 19:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 71b5265c777739dacf222b5aeb41d31c SHA-1: d97fafea3e3f938d4c0f7c3770ba1f30b4fc1a7a SHA-256: a445586615a9a77a3c8db8376ffc9484b7d14fed951e1b98b26134ca36d6e1c4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it functions as a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=schwinn+fitness+130+upright+bike+%2528model+year+2020%2529+review PDF link annotation
    • http://jakartapro.xyz/wimewefisetp3da.pdfIn PDF document text
    • http://003-center.ru/grammaire_franaise_avec_exercices_corrigsimon3.pdfIn PDF document text
    • http://kreativoblako.com/very_mom_seed_ceramide_mask_sheettrrhn.pdfIn PDF document text
    • http://jotelefaxomawut.22web.org/10758081526.pdfIn PDF document text
    • http://raisinshub.club/hp_elitebook_8560w_webcam_driver_windows_10gxien.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/bedding_sheets_that_keep_you_cool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98742c4f-7ba7-4750-89a0-5a1ab3e9d5d6/frigidaire_70-pint_dehumidifier_with_built-in_pump.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/606d3d0e-fd9d-4479-86f4-0eabd3af1e5b/dosage_calculation_practice_problems_with_answers.pdfIn PDF document text
    • http://lakekawe.rf.gd/nodinufixilola.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/dd_3.5_enemy_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/chrome_remote_desktop_beta_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/best_audiobook_reddit.pdfIn PDF document text
    • http://minudumira.rf.gd/vivoderodaxup.pdfIn PDF document text
    • http://xarawab.epizy.com/man_falling_down_sound_effect_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jidosatikim/subexalejubidupo.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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 6776 bytes
SHA-256: 3cd08a4d3ad63400133a7f82b49f683930fbf053303507d554ad7a52bd80e5ca
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 10716 bytes
SHA-256: 5085560c580797817b17054fee6b08f831f699a9afa7d970c1772b508fff0f29

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