Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb20aea753f06e7a…

MALICIOUS

PDF

74.5 KB Created: 2021-06-05 04:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d6f4810e9d432fb38b70dfc2e381f96f SHA-1: 3a53ecb40f270fa1ffe32707ed710ad3c848402f SHA-256: fb20aea753f06e7a56716e87e56ed56c0419c28a91c234fbfdcca4d89ff3c083
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure and numerous external links are indicative of a malicious intent to redirect users.

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://infrive.ru/pbw?utm_term=how+to+check+ac+high+pressure+switch PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457279/normal_6059a4366cd34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_602fa9f5bdb1f.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/zesiledunebi.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/7493014.pdfIn PDF document text
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/4840153.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481061/normal_5ffa071e0a29a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459054/normal_6001d2aa4b139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_6038df99599b4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5fcd960c8c8a9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4495860/normal_60b197eda98c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413117/normal_5fc9c31d06080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372682/normal_6033265102f1b.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/365b67dd-17d5-4b5e-9e14-797b75b02c93/manomibafulavidaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92e32078-bfaa-43b9-9d7d-5549fa38ca1b/benod.pdfIn PDF document text
    • http://jolunatimavu.pbworks.com/f/fuzoliworabugo.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144515979/how_to_get_sponge_collection_hypixel_skyblock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2516b00e-32ba-488a-a69a-7484ebd5de66/bimadowisupate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48464569-13af-4f34-ae1d-5b375255f5f3/56994369497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6245e6c-cc90-4d25-bd6e-d9e4bca4288b/is_tenorshare_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6187f5f-91f2-46e4-9fc5-467f0b7575f0/what_is_meant_by_dynamic_flexibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed682fc6-608e-4cb2-8436-193dd86cf0c1/pelujajimuzajesamaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d618c2-c45a-4761-a169-6feb4f9f4cf2/nora_roberts_new_book.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/how_to_apply_arrear_exam_in_madras_university.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ffeb52-6364-4a11-975d-ff8052e75714/divisores_de_12390.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_off0000e6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B3 5280 bytes
SHA-256: 3a481232c253986bd9036dbfcf8740ddb6ca2c9a25e8fd8c324f037f395698d4
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 10440 bytes
SHA-256: b72449169bc528811a84f5997a230b76c97a19b1aeadae2546ee6aed3ae82dd1

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