Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c282eb52f02818d…

MALICIOUS

PDF

79.0 KB Created: 2021-05-29 03:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ebaf6d39442f492ef4f01a416e0372a2 SHA-1: 599cc9b1209ef9b06ed72203fdb23c28448dfa6e SHA-256: 7c282eb52f02818dfecc6f10497679df7163b3fa7e58447142ae49832eb00643
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, indicating it functions as a link farm. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM strongly suggest this behavior, with URLs pointing to disposable hosting services. The ML classifier and ClamAV detection further confirm its malicious nature, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=klasifikasi+kembang+merak+%2528caesalpinia+pulcherrima%2529+pdf PDF link annotation
    • https://jasuxazej.weebly.com/uploads/1/3/4/8/134875243/2027217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5fdfaa66233e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404955/normal_5fc9a7cfc41e7.pdfIn PDF document text
    • https://werovowota.weebly.com/uploads/1/3/4/7/134766705/6975841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491412/normal_602d8140d99c7.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/bumopexavupu.pdfIn PDF document text
    • https://tomolipuxoris.weebly.com/uploads/1/3/4/7/134708775/89428c824d9fcf3.pdfIn PDF document text
    • https://tigubitutonoxib.weebly.com/uploads/1/3/4/4/134476812/1944651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_605b89c7072aa.pdfIn PDF document text
    • https://totaguzoxexidi.weebly.com/uploads/1/3/2/7/132741029/talunejulul_fafokewef.pdfIn PDF document text
    • https://keduwamiboru.weebly.com/uploads/1/3/4/6/134669925/9531731.pdfIn PDF document text
    • https://feverawujebuv.weebly.com/uploads/1/3/5/3/135314909/1918593c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500692/normal_604397d564ccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365594/normal_5fece937aaf32.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/7637619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421611/normal_604651044ddf8.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/75ca834a-a580-4b04-8ef6-3179786029fd/zuzeladiwosevizefusoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f372315-7d71-4836-a154-159fefb09d92/the_ketogenic_edge_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d1a86f-5317-4467-b513-e0623695838e/vusafejabupixozegelatob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040cd436-e523-4b3a-b8c7-485464b939f3/real_book_bb_scribd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df85ea19-e5fa-41ca-b586-644100cf8c28/ansys_workbench_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d3ecdb8-e44e-4a5a-bea5-f9a05988e07a/prire_universelle_pour_lepiphanie_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e8a3a67-d92c-4433-828f-bf65edae7cdb/monozewonano.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_off0000e80c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80C 5588 bytes
SHA-256: 034db48ddc29169969b62a91f2c42eacd55c390c4cfa678926bc16a712e24c67
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 10312 bytes
SHA-256: c59576c23fd4b5f40bff1af88001eae7719e9269db62f3f8d7e160a0184868aa
font_02_sfnt_off00011e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E10 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361