Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3c28ee36055129…

MALICIOUS

PDF

78.9 KB Created: 2021-03-22 01:32:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5ab19b06f60bf49e129724106c5fb0ff SHA-1: 498217c66b661b3daeca949c41c0837262f0e652 SHA-256: 8c3c28ee36055129e4418749aec88ed7210af2c35e69a90b54bc4c4cd8a35103
126 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'sales performance appraisal form'. The presence of numerous external URIs, including suspicious domains like 'vilenefex.ru' and 'mygamesonline.org', indicates an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/award?keyword=sales+performance+appraisal+form+pdf PDF link annotation
    • http://fuvagezilavez.mygamesonline.org/what_is_universal_design_principles.pdfIn PDF document text
    • http://lnstagramcentre.net/olympus_om_2n_original_priceifytc.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/hfE4Uha/modanugebukudijikomux.pdfIn PDF document text
    • https://cdn.sqhk.co/nozedimasav/hhbyIhf/best_online_video_call_with_strangers.pdfIn PDF document text
    • http://pasipodo.mypressonline.com/zororugabenitebij.pdfIn PDF document text
    • http://everydays.space/how_to_replace_the_battery_in_a_timex_watchyov3i.pdfIn PDF document text
    • http://winoraama.site/jinamodajinubedajpk8.pdfIn PDF document text
    • http://vidclips.design/pusovotukikidutemope7z9lm.pdfIn PDF document text
    • http://lady-bug.club/asus_mb16ac_driverapjt6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/31817e7b-f7d9-4412-817b-8d446d8eb487/lose_weight_eating_applesauce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b739f1-c2b3-47f6-bd87-0f3b0bdda451/which_of_the_following_chemical_compounds_is_covalently_bonded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b69c68e5-2764-4547-8901-825d70e23d22/98026004358.pdfIn PDF document text
    • http://rokabimokow.rf.gd/gizopupozexunixof.pdfIn PDF document text
    • http://xokonafavuz.epizy.com/lapoxezefo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/680c7075-f2d1-4153-b8aa-1413bf280c17/what_are_the_lie_questions_on_the_mmpi-2.pdfIn PDF document text
    • http://vunonam.atwebpages.com/algebraic_geometry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b26f13e8-ed8e-4a4f-aded-baf1e382f263/modebukunemubaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/199199b2-e865-4567-ae04-b9e25c50c9b8/64723215108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55947cfc-2d54-4e31-bbc1-4707287378da/how_many_amps_does_a_typical_refrigerator_use.pdfIn PDF document text
    • http://bubotelerokuz.rf.gd/65609281102.pdfIn PDF document text
    • http://lujajali.epizy.com/interlocking_bricks_manufacturing_process.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 5112 bytes
SHA-256: bf27963f552b7df1948f1212645c8968c11ae270123deba056f9ab3a9baacfce
font_01_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 9988 bytes
SHA-256: 804cc81a48f7c1de9e442318c8c9724de9b509586541f62089140630e3f2ceb9
font_02_sfnt_off00012009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12009 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333