Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74d704603dbfe48…

MALICIOUS

PDF

95.9 KB Created: 2021-03-31 20:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1faca5faada065518e3a79fb1d26de76 SHA-1: 658594911c8c7740d7c496ceab385c38d603b005 SHA-256: f74d704603dbfe487972ebf7b7766481b9903b817b4177a1ae84ad40a77b1228
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to other PDFs, with a primary suspicious URL being https://kuzutuzo.ru/award?keyword=fossil+bryophytes+pdf+download. This suggests the document is likely part of a phishing campaign or a scheme to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/award?keyword=fossil+bryophytes+pdf+download PDF link annotation
    • http://lasozenixirek.iblogger.org/journaux_algerien_d_aujourd_hui.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/21f50c8.pdfIn PDF document text
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/1382331.pdfIn PDF document text
    • https://jofogeva.weebly.com/uploads/1/3/4/5/134505403/sumopizoxaf.pdfIn PDF document text
    • http://xivitej.66ghz.com/3d_star_template.pdfIn PDF document text
    • https://fisadurubimu.weebly.com/uploads/1/3/1/4/131409264/xabefinagerubos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_68baf894dd6c45c6b4b14a0f1f2b3719.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb48ea9-7d30-44ff-88fd-198086867403/kusimotumopesepebowepi.pdfIn PDF document text
    • http://javebetuxupekas.epizy.com/house_painting_quotes_template.pdfIn PDF document text
    • http://gizimup.epizy.com/water_cycle_process_steps.pdfIn PDF document text
    • http://wusipoz.rf.gd/misavopunanev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915e24dd-5b5a-48c1-97c4-2eb9fd791bb9/faduluxinuroroxasa.pdfIn PDF document text
    • https://feedbc21-cb93-402c-9ae2-3476589645d2.filesusr.com/ugd/f3ecbe_d0cfdba42d734b99af8d119eef040a42.pdf?index=trueIn PDF document text
    • http://visuvowimew.epizy.com/winodarozukavejivimataxaw.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_cbddf9316d2c49a9bc99f6bb6efa76f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gateme/samsung_aquajet_vrt_smartcare_washer_code_nf.pdfIn PDF document text
    • http://fazozogujezeto.rf.gd/centos_7_ifconfig.pdfIn PDF document text
    • http://mujozitovisiwud.rf.gd/kububobupumidofibusurelil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46f45e64-dc48-457a-880b-ffe98ea21a3d/how_to_use_bosch_silence_plus_44_dba_dishwasher.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/zelijirupumawurojixapowov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/915421d3-3bd7-40e2-9a77-71647179e7b1/53850013477.pdfIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_dac3464f96f2428d8aadee98427dc2d8.pdf?index=trueIn PDF document text
    • http://sitovimewimes.rf.gd/fishing_guides_in_florida_keys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fb6a3ce-39f6-4ae2-b7b5-ba7ed133b71d/81918954617.pdfIn PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_c1529ab9f8bb40518d646666d16d96c6.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12332 5416 bytes
SHA-256: 1ff1a0a61dec7c6489a93e5541c0e51b62f48080d9e527e7053e7c5857155bbb
font_01_sfnt_off000135a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A9 11592 bytes
SHA-256: d78c81866fcb3384b8c23db0115b276432d205218cdfdf07511b2e5967fe6fbd
font_02_sfnt_off00015c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C42 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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