Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3e75b0749b4978…

MALICIOUS

PDF

76.9 KB Created: 2021-03-20 15:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e3eb642b45938692e3d080e548dcc95 SHA-1: 7aad5e94f461692fca39fb611729edc594305c7e SHA-256: ba3e75b0749b4978101ef05224975d540eeafc5b19bca5d2788602b3f0a51bfb
136 Risk Score

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 indicating phishing and trojan activity. Heuristics identified an external URI and a redirector link designed to trick users into downloading software, disguised as 'apk to windows 10 download'. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing lure intended to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wix?keyword=apk+to+windows+10+download PDF link annotation
    • http://kudukudimox.sportsontheweb.net/oxford_english_urdu_dictionary_download.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/the_fall_guy_season_5.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/22370649597.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/navy_seal_basic_training_length.pdfIn PDF document text
    • http://notojubemeduxan.iblogger.org/ryobi_universal_router_table_parts.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/74791226931.pdfIn PDF document text
    • http://ruvenebigolusep.mywebcommunity.org/58083147921.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/vazudebukiludolovewugux.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/engineering_mechanics_dynamics_8th_edition_solution.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/who_makes_diehard_gold_batteries.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxunukologefis.onlinewebshop.net/el_evangelio_de_tomas_libro_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/vpn_proxy_master_free.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/google_daydream_android_apps.pdfIn PDF document text
    • http://xijejuvi.myartsonline.com/89671658243.pdfIn PDF document text
    • http://sixofiwezuxowa.epizy.com/mezudotidok.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/85955075800.pdfIn PDF document text
    • http://nibemodida.myartsonline.com/lojixixelaluloxavoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/android_mhl_micro_usb_to_hdmi_adapter.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/ielts_band_score_calculator.pdfIn PDF document text
    • http://ritumogadoj.onlinewebshop.net/character_description_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/94782073213.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/the_women_of_brewster_place_summary.pdfIn PDF document text
    • http://kitukogoxav.epizy.com/biology_mcq_questions_for_neet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/19584706728.pdfIn PDF document text
    • http://mubinubamep.rf.gd/cashless_society_thailand.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_off0000f002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF002 5196 bytes
SHA-256: d4f2fe33d1c84ad563bf6a536f38179fffd6742e0df9c4c68cefaa00e7ee6f0c
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 10520 bytes
SHA-256: c0f378802df53f017cc03f8ab5a159c42d6c553e686c716e6897808da85e6240

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