Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bc814bf7fcf45d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 08:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4634807fb5ba6790b9ffceeb85e4addf SHA-1: c391aaea28c472dcf6dd93620a3a899f0ae21999 SHA-256: c2bc814bf7fcf45d1f97fd589f8dfceba33b1425cb3674c6516aa8b6ee3ed6ed
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using an image to redirect users to a URL that promises a free download. The primary URL identified, https://resalured.ru/award?keyword=encyclopedic+dictionary+of+mathematics+volume+1+pdf, is associated with this phishing attempt. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest it's designed to trick users into downloading further malicious content, likely a second-stage 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://resalured.ru/award?keyword=encyclopedic+dictionary+of+mathematics+volume+1+pdf PDF link annotation
    • http://vijofudevadotar.mywebcommunity.org/bitox.pdfIn PDF document text
    • http://mereritijazos.scienceontheweb.net/dikapawomutiju.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/why_is_my_roku_streaming_stick_overheating.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/ampere_s_circuital_law_and_its_applications.pdfIn PDF document text
    • http://fidafevemikiwe.mywebcommunity.org/web_penetration_testing_with_kali_linux_-_third_edition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/db917336-181f-4f43-8005-dc1ad11b1d7f/45358070996.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/dave_chappelle_sticks_and_stones_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c5b24ef-2aff-4294-a9c2-9b65b17267ea/46825364940.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/37807554025.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/208cc_powermore_ohv_engine_horsepower.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/oster_roaster_oven_cooking_times.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/avital_4103_installation_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/modefus.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/election_card_form_6_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/genijusemu/53836654233.pdfIn PDF document text
    • http://zalatikewal.atwebpages.com/investment_casting_defects_and_remedies.pdfIn PDF document text
    • http://bowegasobufur.myartsonline.com/3889891598.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/netflix_tv_apk_mirror.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/smithing_xp_guide_osrs.pdfIn PDF document text
    • http://jokajejuti.atwebpages.com/free_6th_grade_common_core_math_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0342223d-2de7-4e3a-b98a-fe0569185f68/char_broil_kamander_grill_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/borul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b855fd0-09f7-4296-97ef-e712680108a8/40625384682.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD99 4648 bytes
SHA-256: 377586dd011a8c6447f02fe6d9b01ec1caef5ef6e168dcb0122cc61279b54f39
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 5564 bytes
SHA-256: 9e4c631cb614c119b1e6cd61cf570f392c2c5806c3a09ce3c1e012fb69a0b9b9
font_02_sfnt_off00010098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10098 10852 bytes
SHA-256: e56ba1ff85c539ae9adb75b27958fc445eef2e8888ba1d3004fd459ef6bdfe17