Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aff7f37dfb0a38f…

MALICIOUS

PDF

77.2 KB Created: 2021-04-08 03:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 01f075d5bc0e0484d0a95c19419c20f7 SHA-1: 645609e9b065816605efbc25f3132ec297838a68 SHA-256: 9aff7f37dfb0a38fcde3bb01755f47e0742e6aa8d10a4f8489eedaeeabadaf69
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=how+to+loosen+tight+canvas+shoes PDF link annotation
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/jogaxegenesolom_zikapag_vunexujesi_zulevelafaves.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/temeribeleraju-boruvejelu.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/magic_wand_duel_spell_casting_wizard_battleshipw0r1n.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/hvFji6z/long_nails_funny_video.pdfIn PDF document text
    • http://ottics.ru/cours_grammaire_conjugaison_franaislb0lx.pdfIn PDF document text
    • http://senteber.site/58298196815oqndx.pdfIn PDF document text
    • https://cdn.sqhk.co/rizuwevize/chdoheF/tunnel_campground_colorado_map.pdfIn PDF document text
    • https://cdn.sqhk.co/daviluzabidi/3jbWihO/space_live_wallpaper_iphone_6_plus_free.pdfIn PDF document text
    • https://cdn.sqhk.co/gawisibiw/jxggkL2/applocker_whitelist_intune.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494146/normal_60547c593f932.pdfIn PDF document text
    • https://cdn.sqhk.co/sategexarom/0ifihjd/auto_dealership_tycoon_apk_data.pdfIn PDF document text
    • http://merovew.xyz/does_anyone_make_money_day_trading7jlzn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471948/normal_603b8742d8046.pdfIn PDF document text
    • https://mazekijaxok.weebly.com/uploads/1/3/1/4/131453602/5d2d25.pdfIn PDF document text
    • https://bojufare.weebly.com/uploads/1/3/1/0/131070992/fe62bb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_602e011438849.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fa356f-a84c-4a19-af5a-e011da04c891/what_every_guy_wants_to_hear.pdfIn PDF document text
    • http://fatowulur.epizy.com/free_online_ophthalmology_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35c9195-9892-490d-9354-ddd1010ef423/how_to_adjust_tekonsha_brake_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2a7818d-aff9-41bf-8adc-9db18db5794f/what_is_an_example_of_human_behavioral_adaptation.pdfIn PDF document text
    • http://kifixawoxo.epizy.com/palufigozone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aba27fc-53ab-4730-9b64-3b520916bdb4/86968276930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8327d0c2-339a-4382-967a-ce68497e6775/kaplan_new_sat_practice_test_1_answers.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_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 5080 bytes
SHA-256: d01e292ce6763327560e7d8f41bfc5f83b446576bce09c9e70ac0cdf66aa22e5
font_01_sfnt_off0000ff8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8F 11076 bytes
SHA-256: 430d5fbde0012b440d31df8fef4cc8a6390261c12e6bcd0bef1de447847ba61d