Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd18d773b1e4867c…

MALICIOUS

PDF

90.2 KB Created: 2021-06-01 16:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 14d7b0a62ef68d5dae69cee3825452fa SHA-1: b174f0c464ac374d7de45bcd4431459565df8f14 SHA-256: cd18d773b1e4867c3b84cd2a0a74380a0f17b42c14c1e572d809ff4f096e31c6
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 0.9951

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://chcial.ru/pbw?utm_term=scottsboro+an+american+tragedy+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425908/normal_5fda3ae0d4a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498893/normal_600ca34394403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_6061f4ae48523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_601dac1e131fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420934/normal_5fff8191af143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486523/normal_5fffe9fb6fa74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_6009225b25eae.pdfIn PDF document text
    • https://sudegefaxir.weebly.com/uploads/1/3/5/3/135323135/nupukisefonaroro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478383/normal_6002774062688.pdfIn PDF document text
    • https://gajinuware.weebly.com/uploads/1/3/4/5/134597963/mavugoxoxaga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459796/normal_5ffaaa1b3b025.pdfIn PDF document text
    • https://salogisamokowo.weebly.com/uploads/1/3/4/6/134649366/7108659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473926/normal_6057b5999ea69.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
    • http://veweran.pbworks.com/w/file/fetch/144462000/california_dmv_handbook_2020_audio.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/w/file/fetch/144443934/50216323051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a788ba8-0810-4433-bdc1-9c9e70b0da00/the_way_to_rainy_mountain_prologue_audio.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144426585/shapes_worksheets_for_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5382c816-8479-40fb-87b5-89c8430fa301/12371755423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b6bf3a2-fdde-4086-85da-c5ce49b46794/fenaniveruwekidewuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85147795-ac5d-45b6-b880-32049c958740/rca_rcr503bz_3-device_palm-sized_universal_remote_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81232ad5-d98d-41e3-876f-1c3ba2128314/what_should_a_childs_a1c_be.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7afa84-de92-4de6-ad1e-fb523dcf85d0/febowaxojutezuru.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/wifi_hacker_pldt_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58e22ce-d50f-4bc9-92e6-8b8f7a81c4c9/katetabekemedul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b73be7e0-3118-4020-a06a-5584c4764fd3/excellence_resorts_travel_agent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b65299b-a4f5-4141-a40d-fd1b6b2bbba9/58857734007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee25220e-aa88-44cc-ac91-e67aec7581ba/xokifavivogesiketad.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_off00010fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBA 5612 bytes
SHA-256: ba24f87b41e31025d4001e32ba2be8da2d5ea9c2eebbf810673b6c0eba3d5280
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 11852 bytes
SHA-256: 96b6ccfba7847a7a3f81ff1e34678f03d81d6dc0f12b70713fac0a1282bb1753
font_02_sfnt_off00014aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f