Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b15b9d0ea93816…

MALICIOUS

PDF

80.5 KB Created: 2021-03-06 19:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 788bc444e97d65ed7ff31a6fb309fe55 SHA-1: 2619bf2b4dbac5b4cabfb711c4a651c522724cb2 SHA-256: e4b15b9d0ea93816e572022e2426fd10a4f87b792e0324c1ed5116417cdf600c
166 Risk Score

Malware Insights

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

The PDF contains numerous URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to 'Murray riding mower battery voltage' to entice users to click on the embedded malicious links. The heuristic 'SE_SECURITY_BYPASS' suggests the document may also instruct users to disable security software, further indicating malicious intent.

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nipisod.ru/strik?utm_term=murray+riding+mower+battery+voltage PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4488316/normal_603e17ef1e745.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/VbihicV/verukukimav.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/j0thbhf/23610762016.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/eXexggq/nokia_old_phone_ringtone_mp3_download.pdfIn PDF document text
    • http://ueuniti.xyz/1794-ie8_manual5yr7j.pdfIn PDF document text
    • https://rurevudo.weebly.com/uploads/1/3/4/2/134265418/37688924a2a.pdfIn PDF document text
    • http://skidki-day.site/87029451831vhamz.pdfIn PDF document text
    • http://probnik1313.tech/kms_activator_win_10amc6d.pdfIn PDF document text
    • http://xadixul.66ghz.com/sustainability_reporting_software.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_5ff41e91dea1b.pdfIn PDF document text
    • http://fefosawixamuwow.22web.org/gelokolewof.pdfIn PDF document text
    • https://mezepimera.weebly.com/uploads/1/3/4/8/134860759/2539bd033437a.pdfIn PDF document text
    • https://dujikofuzi.weebly.com/uploads/1/3/4/6/134610135/35b39a97057.pdfIn PDF document text
    • http://fomuvegikutidob.iblogger.org/what_does_the_parable_of_the_unjust_steward_mean.pdfIn PDF document text
    • https://lirejodeju.weebly.com/uploads/1/3/4/6/134628820/bb48e8b855.pdfIn PDF document text
    • http://prosale.company/fireflies_piano_sheet_musicnlzw0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ff09edf21d5c.pdfIn PDF document text
    • https://fejoburu.weebly.com/uploads/1/3/0/8/130813906/semozezinugigu-ferirurusez-fovunejiz.pdfIn PDF document text
    • http://tejafosiko.iblogger.org/gevasakisakopujeziko.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/n7Vmgfq/get_more_followers_on_instagram_free_app.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/b5e3e753-de70-4b49-b329-857c72507dfa/how_to_change_the_filter_in_a_lasko_tower_fan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/953e1b15-d01b-4f0f-ad74-90edb072bf9c/51915780270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0732ec7f-b2af-46e2-b252-270f91866d81/nobelavetefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9941a4e-49d5-403a-8adf-70c87adf7e9c/shadowhunter_codex_hardcover.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 5368 bytes
SHA-256: 8a435d48baffd96f3b8a77e06af72e6921e4ac356651afcf1c7d1f8cdda5c10a
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 10588 bytes
SHA-256: f2bf7a469eaeba47ca0550445f1a9b65aa5e4d2579cb4707c48cb46980018ac5