Malicious PDF — malware analysis report

Static analysis result for SHA-256 316b0c986096313b…

MALICIOUS

PDF

71.6 KB Created: 2021-02-18 19:05:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 3c4c23126b4a5eaa686dea352303a133 SHA-1: 10650f217bdc62740c4e5a4d57bab9f66ae9d8a7 SHA-256: 316b0c986096313b0312387d47b2a0087b868d831878c9283d1d1045f084ccd9
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=avast+vpn+premium+apk PDF link annotation
    • https://pidofuvu.weebly.com/uploads/1/3/0/7/130739764/zibumonujob.pdfIn PDF document text
    • http://logunej.iblogger.org/best_carrom_board_games_for_android.pdfIn PDF document text
    • https://zagamujibagixon.weebly.com/uploads/1/3/5/3/135326067/joninuvelafe_jenewe_fijulek.pdfIn PDF document text
    • http://zuwaweno.iblogger.org/5377265506.pdfIn PDF document text
    • http://ranomurivokav.22web.org/github_branching_guide.pdfIn PDF document text
    • http://wikexulefusopa.iblogger.org/89226814764.pdfIn PDF document text
    • https://fewibobukuk.weebly.com/uploads/1/3/5/3/135309281/pijuxusufukux_kisijejuzobowi.pdfIn PDF document text
    • http://dodemawaj.iblogger.org/weviluzuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://netubufetolanup.rf.gd/can_power_outage_cause_smoke_detectors_go_off.pdfIn PDF document text
    • http://jetumodegupejit.rf.gd/math_worksheet_generator_addition.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/44061981268.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/cardinal_newman_sixth_form_open_day.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/que_es_answer_questions_en_espaol.pdfIn PDF document text
    • http://bijamujijupife.epizy.com/42535847297.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/tuwudipejunogimuvilud.pdfIn PDF document text
    • http://rolodumom.epizy.com/93184243790.pdfIn PDF document text
    • http://gematufevisuw.rf.gd/xaxapedal.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_off0000dce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 5044 bytes
SHA-256: 4c0a8db12b49f5959eae8a8b3256defcc2a5fce3c86296d34c7beb6af8bc75dd
font_01_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 10360 bytes
SHA-256: 349c53f23645ff9c988db85107d828f9bf289a8b8f00d614e879322eb8aeec64