Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e94368cd26ada4…

MALICIOUS

PDF

106.5 KB Created: 2021-09-29 01:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2bcbf1a3cdba2ed66d0f6e5cee73bda2 SHA-1: eb073055cd37ca1d1fa3840861b5716c9938b6f3 SHA-256: 77e94368cd26ada4d063da49e4b9b3cd08abc69675b1df0e9f5af0f6d3dd5521
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=meciuri+online+pe+android PDF link annotation
    • http://mama-care.com/UserFiles/file/rejujamilesodip.pdfIn PDF document text
    • http://oguraclutch.cn/uploadfile/files/bewolimezoviwibitu.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/wedironipiwivokuwikafim.pdfIn PDF document text
    • http://mdtrend.hu/files/file/kimawilokogasim.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/93382302402.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/53740774239.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/durozabifef.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613807dfdca29---vijowefelalu.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/butun.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613573fb887bf---zadagorusowulexomub.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/jujonotipofiwozasominisu.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/xulimipaxasajeb.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/witulur.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/tegizibajapefanomimijobik.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/fisesatonasanujamivenub.pdfIn PDF document text
    • http://skene.es/userfiles/file/76179245334.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/80174112995.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/kodaritexasu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/vozirewar.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210928/file/69265486912.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/karopitaxililajudogoj.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/49494005888.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/zowurififajusudababusog.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/8110453114.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 18372 bytes
SHA-256: 3127be9f3ab622c2de18651e50e4e143a4d57b16794c6e632345bfa4e4567b7d
font_01_sfnt_off00015697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA4 5736 bytes
SHA-256: b3fc260ea0f1b3ae377921baf3f29d22e459b46737ec46126280014f1dabe146
font_03_sfnt_off000183ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AC 10336 bytes
SHA-256: 8fe2d42ecad33a6c431e6a017a227ce01d32432a5e3a86863f3ccc4bba025cd3