Malicious PDF — malware analysis report

Static analysis result for SHA-256 62440c91455d2d41…

MALICIOUS

PDF

83.0 KB Created: 2021-03-17 19:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a370bd4052cd01170e9e7b79fbedb21 SHA-1: 101c4bbcc9a2162ea95e9f58edb9cea2e157a578 SHA-256: 62440c91455d2d41dc6bb52ea0d478ecf9de55aaba5ba08fe00d2f02d29a38cf
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 0.9997

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 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://vilenefex.ru/wix?keyword=ultimo+marvel+wiki PDF link annotation
    • http://mufutekuson.getenjoyment.net/4798891188.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476282/normal_601cf9b290a1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371553/normal_5ff5ecef9c930.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446036/normal_5ff4ecd91d4e1.pdfIn PDF document text
    • http://bivoliku.mywebcommunity.org/86322432812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387060/normal_600dd629709ba.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/the_hound_of_the_baskervilles_1939_ok.ru.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/11dc342b-0a08-4d7a-bb0e-62837de8839e/the_secrets_of_underground_medicine_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a8c0206-29a5-49b4-98fe-24e4a8a81a63/pifusesokezinozisewa.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/nojutaxojavulemi.pdfIn PDF document text
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_53237c27cd6046a690ccc2a34fc6ee2b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47717f0d-8515-45b0-a21f-1d994701476e/memekokezeva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/529ed9da-2676-4cf7-bf05-43de0db5dcf5/grade_3_reading_comprehension_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b586bc80-3ee3-44d0-9080-3a3ffbe9983d/kenwood_ts-440s_hf_transceiver_ham_radio.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_e4d3985cb36b41f795d82d80c3fd8cb8.pdf?index=trueIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_09fdabac6c244d328a00d3ad90030c3c.pdf?index=trueIn PDF document text
    • https://19e6fc83-c281-4d06-93fd-e8b16a02b90a.filesusr.com/ugd/ce5d00_7d252a4c55664e3991e1ecce48378f85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51602dc8-ceb2-4afa-83f0-556889d49479/how_to_fix_a_carrier_furnace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3609eb74-fc0e-43de-82ae-2a77ea1c27d3/vimazedavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23da6c32-814e-4792-8f64-56ff2a2beb05/79646352711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d23aa8d-fd20-4d61-acb8-0fa8563f838b/10542957397.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_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 4860 bytes
SHA-256: 6f6a6df6b2f425eef34337c9dd249f55012f16e243c8feacc2f54b19ef44ea67
font_01_sfnt_off00011624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11624 11852 bytes
SHA-256: 52ba651ff367280f0e2f107c4eb11d3d79dc1a8b779c9ff57d503e3c0fd02508