Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11b17d80b5054f8…

MALICIOUS

PDF

96.3 KB Created: 2021-04-05 14:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b13ee8cd936f6dd8fa9e0770c434cf10 SHA-1: 904a6c420b72602d2434a4c90ff67d9f7d230a51 SHA-256: a11b17d80b5054f8badc7b4915542c0142056abf65e9b0eab866f84d8b528ffd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to manuals and technical documents, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://pelibifir.ru/wix?keyword=singer+simple+e99670+sewing+machine+manual PDF link annotation
    • http://folivapizi.66ghz.com/when_will_samsung_s9_get_android_10.pdfIn PDF document text
    • https://cdn.sqhk.co/nixafusoda/bhdziic/digivosiwuvejavexaso.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/piwunogawejifufatefo.pdfIn PDF document text
    • http://wuvigirigu.22web.org/maxunasefufevuwa.pdfIn PDF document text
    • https://cdn.sqhk.co/vokalater/Mgfdehc/north_star_bluescope_steel_annual_report.pdfIn PDF document text
    • http://namafafiteg.mypressonline.com/mes_jobs_2020_advertisement.pdfIn PDF document text
    • http://nebolitazezo.iblogger.org/fronius_symo_inverter_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/ajiqjcq/jivego.pdfIn PDF document text
    • https://cdn.sqhk.co/bulegumu/jcmicUw/86644481302.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/wAgdohh/stickman_zombie_survival_3d_apk.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/67768058330.pdfIn PDF document text
    • https://cdn.sqhk.co/viforoge/6lFihja/fafinivajivakonupabevax.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/jjhiE3J/kejusupagukepetojesiro.pdfIn PDF document text
    • http://vegifeda.mypressonline.com/why_do_rabbits_change_color.pdfIn PDF document text
    • http://bokevefinobi.iblogger.org/jose_maria_arguedas_obras_completas.pdfIn PDF document text
    • http://gusanod.22web.org/classroom_management_theories_and_models.pdfIn PDF document text
    • https://cdn.sqhk.co/bipufawawi/pTjcTOI/28018673618.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/gfoOqsh/general_electric_microwave_ovens.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://getetir.epizy.com/43458184530.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/wedajijemefetozegodelexi.pdfIn PDF document text
    • http://sukidagijonola.rf.gd/98965766663.pdfIn PDF document text
    • http://ribitotuv.epizy.com/accounts_receivable_management_policy_theory_and_evidence.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/56035730514.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/bekezed.pdfIn PDF document text
    • http://sibexelopuni.epizy.com/dont_listen_to_music_while_working_out.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6F 5764 bytes
SHA-256: f1303ea48ac7aa836d3d90dbb98686f5b6bf169e64698195c744faad23dcd599
font_01_sfnt_off00013ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE1 11132 bytes
SHA-256: d9b97ffccaea8edad8d2e741986802b932f5a9cc2ff45b69d09dc428b5335c3f
font_02_sfnt_off000164ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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