Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e07bb1784e28b8…

MALICIOUS

PDF

75.4 KB Created: 2021-03-17 10:37:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b1499f321b8bd91973fa40b50e036d2b SHA-1: cb675812ac92a24b3583c5980bf60c2c8d146aef SHA-256: 78e07bb1784e28b8c4a72d1266e5a26067107d9ed562abbaf7504bbd139dba49
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, many of which point to disposable hosting domains and appear to be part of a link farm designed to distribute various files, including software like 'mobogenie pro apk'. The presence of these URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=mobogenie+pro+apk+latest+version PDF link annotation
    • https://cdn.sqhk.co/kofosenolo/chf5hiT/healthy_chocolate_recipes_without_coconut_oil.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/cF2ygda/lisudiwigidixalapizagu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_6034de39943c1.pdfIn PDF document text
    • http://davifil.iblogger.org/anger_of_stick_5_zombie_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449618/normal_601a84545e3ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384308/normal_5fc894780afe8.pdfIn PDF document text
    • http://pavaverijakat.iblogger.org/best_4000_psi_pressure_washer_pump.pdfIn PDF document text
    • https://cdn.sqhk.co/duponetix/dMsjija/xizefala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459937/normal_5fdc0ffe4f23b.pdfIn PDF document text
    • http://zazutokanug.22web.org/49560192853.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwibagula/WgdTkij/degafukedegavibego.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/litunux/10416361970.pdfIn PDF document text
    • http://xazejove.epizy.com/samsung_j415f_ds_flash_file.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/57677683890.pdfIn PDF document text
    • http://xekokopadupino.rf.gd/ice_breakers_gum_sugar_free.pdfIn PDF document text
    • http://zuxebalu.rf.gd/what_is_the_formula_for_lateral_surface_area_of_a_cylinder.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/name_a_star_certificate.pdfIn PDF document text
    • http://nerepigov.rf.gd/branches_of_classical_physics.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/denon_avr_2312_software_update.pdfIn PDF document text
    • http://kitalanexu.epizy.com/ben_10_song_in_tamil_free.pdfIn PDF document text
    • http://faxajipemafeb.epizy.com/angular_7_checkbox_formcontrol.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/the_expanse_season_4_episode_5_synopsis.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 5256 bytes
SHA-256: 9312d2a6d2ca8f36240c1315c49ce4ecac99213720e0df468b8bb413807eda5c
font_01_sfnt_off0000f725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF725 12044 bytes
SHA-256: 171f5855d4ac760a2db057c6f4036f3346b17cdb8aff916f8802637fdcb55a05

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