Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd111106f7d1831…

MALICIOUS

PDF

87.1 KB Created: 2021-03-18 20:27:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6bd273c88112f57cd72dc99b0ab866bb SHA-1: a73d40487f247893f4289dda2af43050e2dd9d3a SHA-256: abd111106f7d1831d89f75834154005196bf0cb1be77b16734bc528e95eb9b3d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The embedded URLs point to various domains, some of which are hosted on disposable platforms, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/award?keyword=lagrangian+and+eulerian+description+of+fluid+flow+pdf PDF link annotation
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/863ca6085d042f4.pdfIn PDF document text
    • https://nojufetabug.weebly.com/uploads/1/3/4/7/134748112/2444351.pdfIn PDF document text
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/6811347.pdfIn PDF document text
    • https://tunizobun.weebly.com/uploads/1/3/1/0/131069832/8adee0dce3c.pdfIn PDF document text
    • https://fexixulakuruzas.weebly.com/uploads/1/3/4/7/134723370/teraginiji.pdfIn PDF document text
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/wojuxajadixeta.pdfIn PDF document text
    • https://filogeruziwumu.weebly.com/uploads/1/3/1/4/131406947/e04aa708.pdfIn PDF document text
    • https://pituluwo.weebly.com/uploads/1/3/1/4/131437949/8832443.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://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_b8e25d62a6c6447f9a312e98fbae9378.pdf?index=trueIn PDF document text
    • https://46b09160-81f9-4cb3-9cca-f7b5b0c0229e.filesusr.com/ugd/179cc6_8d6b0549cfd34542995b6d47d6ef592f.pdf?index=trueIn PDF document text
    • https://1237a3da-0b33-4890-9ba9-974507bf2590.filesusr.com/ugd/3e0cb9_fa3aca236cd7449d8938d1c2e22de7cb.pdf?index=trueIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ee326e9d21db4d64b25ca62d873c6821.pdf?index=trueIn PDF document text
    • http://komusera.rf.gd/jasirodegozuru.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/hp_patwari_bharti_form_2019.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/jilefiwevabuw.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/turavujukowinebo.pdfIn PDF document text
    • http://gidubabe.myartsonline.com/is_blast_protection_worth_it.pdfIn PDF document text
    • http://timodetunidup.epizy.com/zobapako.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/34276839123.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/how_do_i_reset_my_first_alert_smoke_detector.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5236 bytes
SHA-256: 31a076a62783e405e64b37b041a5f29e8375f48ddcb44e5b3fd7b45e0c793a8d
font_01_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 10880 bytes
SHA-256: cb8d486e9be34b10cd635ae8bd9e6a0d0602c5d72d3fb7bb4244e568b1abb65c
font_02_sfnt_off00012bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAC 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74
font_03_sfnt_off0001403e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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