Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4b6e0eb1052154…

MALICIOUS

PDF

74.0 KB Created: 2021-03-11 01:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d8df1450acb9445c515328dc5334cb2b SHA-1: a7bd7b6f3371b1228b8d3a66169adcd8bd202ded SHA-256: 4f4b6e0eb10521540de535463badfa64cdcf2f656bbd1812065c74b8b85f49ab
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, suggesting it's part of a link farm designed to redirect users to potentially malicious websites, such as the one hosted at maypoin.ru. The document body, though heavily obfuscated, appears to contain metadata related to its generation, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/wix?keyword=metro+crossword+puzzle+today PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461207/normal_604850234f493.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/fxLadJS/wawapojufuxinedixowawix.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/egcIKg2/94402293836.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422628/normal_5fc8e23788cd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411503/normal_60301cc164588.pdfIn PDF document text
    • https://cdn.sqhk.co/biwizalibe/ihQb8sm/border_officer_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuzekovodi/Kvhae0r/73272360237.pdfIn PDF document text
    • https://cdn.sqhk.co/gizadomoto/tjhjIhg/steelers_football_training_camp_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_b094dd4c993142b0974c49f77c45548b.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_9506303f51874bb0bbcd8282ea0c6422.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_b1cd463dd3ec4cf19c66bdb32c3aa38c.pdf?index=trueIn PDF document text
    • https://bcd7deca-fd5d-492b-a220-d373ca515bc9.filesusr.com/ugd/12f4eb_3d6e3980312d4164a567ed2e6aee5632.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_1ff51aa008a541499bdc0cc6fd9aded4.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_2687dd1453894ce7a444ab85cadae8c2.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_e2bf220a8fc24997831e2458da57a38e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5cee557-04c4-4f2e-94a1-4230ff8a0b32/fukuxefotaroworenoxatu.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_ec8a8509dbf346e7bd8b991e44782e42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/136a135c-7d4c-425f-80c1-2235576a0b27/wimpy_kid_movie_actress.pdfIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_9c56f18e07484016a9be3d07b8fe7628.pdf?index=trueIn PDF document text
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_043c3d9e4eb74c3eab00ecf182058e23.pdf?index=trueIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_2b80650d476e4dde8add194139aec314.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02ae26a-6aeb-413e-8fee-1d90b7bb9e4e/who_has_read_48_laws_of_power.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_4f2e93574f6e4bb9ac3c76452e04b8ac.pdf?index=trueIn 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_off0000e59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59E 5316 bytes
SHA-256: e8af6dc4ee6079c244cb1a59bbaf20c24f0034a65d062f0861a67b6b33c08893
font_01_sfnt_off0000f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7ED 10276 bytes
SHA-256: 0b7ec1f255a8bea2552d88befc93a116efb6806276d1e559ed2360ab8d08aef9

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