Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d9fdd278fcb0f9…

MALICIOUS

PDF

113.2 KB Created: 2021-05-23 20:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 937a24da3c9d3b6c9193f3520dbe9dda SHA-1: 567e6ea380d1d6adb42295bf31191c257b92b6f8 SHA-256: 83d9fdd278fcb0f986e8edd0f3ad3045cb7756680537aaec76d09c3188375450
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/strik?utm_term=upcoming+vr+games+for+oculus+quest+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457868/normal_5fdb819ad3764.pdfIn PDF document text
    • https://wigikezidewuti.weebly.com/uploads/1/3/4/5/134578964/zokilerazebaf-xagipam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418972/normal_601c701db7a71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416316/normal_5fc9a17b76cd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412599/normal_5ffb1639ef0ff.pdfIn PDF document text
    • https://fewadagagex.weebly.com/uploads/1/3/4/5/134594838/5215668.pdfIn PDF document text
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/pakalawaw.pdfIn PDF document text
    • https://boferisavupase.weebly.com/uploads/1/3/1/3/131384298/sabetisogozedomikaga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_60302a643c7d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494165/normal_606170fb5910a.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/247f4a23-9448-4a1b-bd89-32332b46b9e7/diablo_2_1.13_d_patch_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/27825522248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3438b57e-86ae-425b-be68-a51d7b78f5ab/84453820611.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/how_to_adjust_time_on_g_shock_ga100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7ba070-92cb-43e8-9c97-181c88eb507a/57437786966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4aca52-69b6-4526-aed6-1e5dd42f952a/paintball_jungle_waiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93983e22-495e-4cb0-b71b-00b2569577ea/bawegorusasezolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06cdfa8d-ecc7-4e2e-a635-634ad60baf11/22276167152.pdfIn PDF document text
    • https://s3.amazonaws.com/xijuxosisomuna/lodger_rental_agreement_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07df8f48-6911-4951-b56e-c470d481ff53/can_u_sleep_wearing_contact_lenses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c37e328-9530-4545-9328-1c5f9abba73f/how_to_use_interdynamics_ez_chill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f80f3dd-01f8-4e2b-9bd7-efc77bd48e70/molujusuzuvemekebafa.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_off00016f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8D 5524 bytes
SHA-256: 062be1ca3f84cf0a87ce9d726b7f8f70a5cc247be84a2f3fa103533319365167
font_01_sfnt_off00018245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18245 11328 bytes
SHA-256: 50d1075e8e77298f22eeaa6d633dacf4080fd6d57f713537d62e28f613e1f08a
font_02_sfnt_off0001a8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8CE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3