Malicious PDF — malware analysis report

Static analysis result for SHA-256 023825418040d299…

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 19:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb983a0a2a794f48f33eb89effddc8a9 SHA-1: 6ba4d29ce98daccb696f2f345defa9eadef7f3db SHA-256: 023825418040d299461ed46c2072c788363c3a6e5c68b0233b5bdbf76c3acf83
134 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic indicate an attempt to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/wix?keyword=marvel+strike+force+free+power+cores+2020
    • http://pasikufopubiwo.mypressonline.com/matematicas_financieras_capital_concepto.pdf
    • https://cdn.sqhk.co/lelabepena/hLPajjI/zara_black_friday_2019_hours.pdf
    • https://cdn.sqhk.co/letijefa/y2geahe/vejekesel.pdf
    • http://reggis.info/android_file_transfer._com_filetransferhlqmd.pdf
    • https://cdn.sqhk.co/vipujitebiki/iiSHBif/nilivazupotonugesirivuwaj.pdf
    • http://volalagokiva.sportsontheweb.net/nubukowonujolosiwado.pdf
    • http://lidlid.xyz/kogawarumikapuzegonottexd7.pdf
    • http://future-techno.ru/rukadidefazuja6dzf8.pdf
    • http://drovazvenigorod.ru/90637811037g0fpe.pdf
    • http://fodelogutejamit.getenjoyment.net/94865343648.pdf
    • http://winnerslm.space/867688558729sk2n.pdf
    • https://cdn.sqhk.co/nodujugebi/he2shdq/kovewusapetenegakawopene.pdf
    • http://sidufapas.mywebcommunity.org/televoduwerolidixuji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a4aa51cc-e4f2-437c-bd41-fc4f8e892434/navy_seal_training_website.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/california_halibut_fishing_report.pdf
    • https://uploads.strikinglycdn.com/files/67c40c09-5da4-40da-8354-8ba08a8f6a0e/support.nintendo.com_error_code_2813.pdf
    • http://kepofif.onlinewebshop.net/autocare_car_wash_business_plan.pdf
    • http://nejimafalun.onlinewebshop.net/dituwogipul.pdf
    • http://gurabagoderes.atwebpages.com/amazing_grace_free_download.pdf
    • https://uploads.strikinglycdn.com/files/4e229ca0-63ff-4f8f-bbf4-ddbd217d064f/16070233500.pdf
    • https://uploads.strikinglycdn.com/files/eff60529-c0ab-4eae-a0a4-50b8c043aad9/kukazerunoridit.pdf
    • https://s3.amazonaws.com/bisiku/chhota_bheem_full_movie_tamil_movie.pdf
    • https://s3.amazonaws.com/gateme/s-290_unit_6_quiz_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e168.bin
df01dd7d75158b640508830271f8adf48d10e958250f3dd461be71bc62cd7ee9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 5504 bytes
font_01_sfnt_off0000f459.bin
bec213d211194b521de73d4dca27d6a23e3fa36e280dcf9856da0d53daf381ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF459 10568 bytes

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