Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa93922f6e08348…

MALICIOUS

PDF

70.7 KB Created: 2021-01-23 05:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: df80219fb545c2372c5111e2c1b5f9a7 SHA-1: efb636448336939e60c9254eadefcc97acec4ede SHA-256: 4fa93922f6e08348ed6e77cbfdb48428e765e664b62a08f540430191d455b35f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate maliciousness, with the PDF_SEO_LINK_FARM heuristic identifying a mass of external links. The embedded URLs are likely used to distribute further payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffset.ru/aws?utm_term=curso+completo+de+viol%25C3%25A3o+gratis+pdf PDF link annotation
    • https://gifiboluf.weebly.com/uploads/1/3/2/6/132681188/deefc17876d7ccf.pdfIn PDF document text
    • https://site-1199467.mozfiles.com/files/1199467/rider_waite_tarot_deck.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/mpZihhh/matchington_mansion_hack_club.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/djhgdgj/pixel_zombie_hunter_mod_apk.pdfIn PDF document text
    • https://site-1177290.mozfiles.com/files/1177290/splash_screen_android_studio_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/eljigju/vidiq_app_download_for_android.pdfIn PDF document text
    • https://site-1168247.mozfiles.com/files/1168247/74401589901.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/MhhhgTe/fish_liver_function_tests_abnormal.pdfIn PDF document text
    • https://cdn.sqhk.co/regavebike/lhehgha/pre_civilization_marble_age_hacked_apk.pdfIn PDF document text
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/liwunu-wuderabiv-dazexe.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/1Njqpy0/75834914050.pdfIn PDF document text
    • https://napolapivu.weebly.com/uploads/1/3/5/3/135303388/856b5.pdfIn PDF document text
    • https://nugijokokul.weebly.com/uploads/1/3/0/9/130969158/tatunekubixisuxiwiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/hfggYs6/shooting_games_unblocked.pdfIn PDF document text
    • https://site-1177275.mozfiles.com/files/1177275/transitive_intransitive_verbs_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kotasogova.rf.gd/bowmasters_all_unlocked_apk.pdfIn PDF document text
    • http://nabesazuxipuf.epizy.com/tone_and_semitone_worksheet.pdfIn PDF document text
    • http://fevepapowiwed.epizy.com/filme_alerta_lobo_dublado.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/image_asset_studio_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/43787982406.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_off0000d022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD022 5756 bytes
SHA-256: c739d16f046bd3e417424166791c9d16056ad6af09409e46f6852def2b8ccaa9
font_01_sfnt_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 13472 bytes
SHA-256: 5ac0302126979cef4ccf95f39eecd0713cce6e17172ea541dfe3f87d984130f5

Open this report in the interactive analyzer, or submit your own file for analysis.