Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e7b1a6ef77494a…

MALICIOUS

PDF

74.3 KB Created: 2021-03-05 18:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 7ff7f84fb67fa22346a9405344a329f0 SHA-1: 09fe0649788ca089d7de31ba82f55678ebe8e778 SHA-256: d1e7b1a6ef77494aa2e5d82b9bec1c37efa223f92f664d52fc31a5e2887b317f
134 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, suggests a lure related to 'heat exchanger calculation xls', likely a pretext to trick users into clicking links that lead to malware downloads. No scripts were extracted, but the overall structure and URL analysis strongly indicate a phishing and malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/strik?utm_term=plate+type+heat+exchanger+calculation+xls PDF link annotation
    • http://fruits-summer.fun/418735893934y8ic.pdfIn PDF document text
    • http://padojuputiki.iblogger.org/kagiloza.pdfIn PDF document text
    • http://wodidovurezugeg.22web.org/rikki-tikki-tavi_darzee_wife_character_traits.pdfIn PDF document text
    • https://cdn.sqhk.co/bafesugoguwi/dsZibib/sogexipazerufetawejelone.pdfIn PDF document text
    • http://iminn.ru/tijejilaxaniponta69.pdfIn PDF document text
    • http://niwapona.iblogger.org/teamviewer_13_ubuntu_18._04.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/igiiWsY/4477664948.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/fLiiihb/download_knife_hit_mod_apk_ios.pdfIn PDF document text
    • http://mivejuvididu.66ghz.com/duderigagi.pdfIn PDF document text
    • http://good-production17.site/42673942998nuw47.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/eCgfRjb/safe_notes_app_iphone.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/31654516476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatokelemek.rf.gd/wodikizenidesu.pdfIn PDF document text
    • http://rizivubonulej.atwebpages.com/its_called_a_breakup_because_its_broken.pdfIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_18ef5ac840584a7eae9a5a9fd58a10ee.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_81f5a0aeba514ed1be917a31a159f63d.pdf?index=trueIn PDF document text
    • http://womopemi.epizy.com/92242788666.pdfIn PDF document text
    • http://diwiludoki.rf.gd/google_chrome_full_setup_offline.pdfIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_462ec109ae2249098eff235788a95365.pdf?index=trueIn 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_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 5368 bytes
SHA-256: 77e0bd5b464a97653fa3dbf869f426245266f5ffbc93aac50cc383897dcbe3e4
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 12684 bytes
SHA-256: 482ec5816a540fb4423554f74ac4a8b9b67e3eda7aed8d8dafe28509525bbbad

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