Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5ab4472e9f7b43…

MALICIOUS

PDF

79.3 KB Created: 2021-05-30 19:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f4c8d0c86c6f97b49d34ec2ad5b18175 SHA-1: c1956053992cf756fcc17e122d62a302ac48dd1d SHA-256: 6b5ab4472e9f7b43761175dbb042241c7207ec530e3242f4d28ac3e5f52d6bbe
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://maypoin.ru/strik?utm_term=download+battle+trip+sub+indo+drakorindo PDF link annotation
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/8a1f930c.pdfIn PDF document text
    • https://bunafigokakataw.weebly.com/uploads/1/3/0/9/130969192/jisezatadilow.pdfIn PDF document text
    • https://wupugosow.weebly.com/uploads/1/3/1/3/131382590/dugasupixusekozijowo.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/jubirudimusib.pdfIn PDF document text
    • https://panesiwosejel.weebly.com/uploads/1/3/0/7/130739396/pupuvopuxozibis.pdfIn PDF document text
    • https://koralazuvumo.weebly.com/uploads/1/3/1/8/131871516/fixin_jowexemij_zewogif_lunesigeseboxo.pdfIn PDF document text
    • https://bakemelufipunuj.weebly.com/uploads/1/3/4/8/134888112/5599579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_6058e4e68726d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418575/normal_5fdee369129a6.pdfIn PDF document text
    • https://modatuna.weebly.com/uploads/1/3/7/5/137509789/981565.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/2fcd26d2-aa6b-4ba4-b7e2-326c5afa5764/fender_hot_rod_deluxe_40_watt_tube_amp_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4bb6579-9509-4cce-8da9-d94db18fb987/bigolajoselivowen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad45678-eb9a-41f4-ae09-b4a0f3b70345/custodian_of_records_affidavit_missouri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20a9d14e-c99b-4203-82e0-43747591d161/44050229828.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dc9c75-7f57-4458-9632-61b020c2d484/guruduzemuzoxikadoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e348f4c4-853d-4870-9b12-65917ddf0410/41690054839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cca9f49-37d9-40a6-88df-f440ee74fae0/gugimolepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/285228a6-8279-4c85-94d7-18c5afa39ab3/14485940669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c336c3f2-c748-4395-80c9-d6fc1b3e8fe6/16706901384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5513a9-0565-4948-9c92-7722a151f59e/52595538942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/410db9c9-cf56-4de4-b4d9-7cc2d1af3415/ethical_hacking_meaning_in_bengali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b5fdefe-b791-4ecb-9ef9-1204df761657/how_to_connect_rca_cable_to_pc.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_off0000eb8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8A 5132 bytes
SHA-256: 0ea093b58284dcb93bab037bb25759e7e4af56ec979d85f753d67744731959f0
font_01_sfnt_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 10676 bytes
SHA-256: d7da4bf403f9e56cc509270c0c77a69c554c1d037ffc7003ef9dcd3621be0ea1
font_02_sfnt_off000121b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3