Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b22ab91ca923cbd…

MALICIOUS

PDF

98.0 KB Created: 2021-03-22 22:47:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 38c92b4f356fa14dbd29332d43ac1117 SHA-1: 136f7f975ff4c30feebddb7126534cbca076b6c1 SHA-256: 2b22ab91ca923cbdc0d6b1d593ef25fb990cbec95c69e2d36fc5208c644b6ad5
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 0.9989

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://seumenha.ru/123?utm_term=audiomack++new+music+4.+1.+5 PDF link annotation
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/pevawudozojuvajidu.pdfIn PDF document text
    • https://sogutujugaj.weebly.com/uploads/1/3/4/4/134403955/bibinukegegoredazog.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/tefajizutenavulokaj.pdfIn PDF document text
    • https://kukibujez.weebly.com/uploads/1/3/1/6/131637652/1009203.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/lebaxikamuzat.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/mefineb.pdfIn PDF document text
    • https://fuvetowonilup.weebly.com/uploads/1/3/1/3/131383456/susevarib.pdfIn PDF document text
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/kidovavo-xozida-fokutiju-redag.pdfIn PDF document text
    • https://safusugefivelu.weebly.com/uploads/1/3/4/3/134346528/duzolukiz.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/gagemonibefodusiweg.pdfIn PDF document text
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/bujak-pomupof-sizuvixomidiji-nopoj.pdfIn PDF document text
    • https://cdn.sqhk.co/zuvaworizon/chvTgiu/60365127808.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/e2ihchg/senaj.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/zuzologawow_mopekozeloruvu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b7953657-6b45-4ea9-9d9d-f701e3f26526.filesusr.com/ugd/45996c_4314d1d56ada4872baf50778def133b2.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_eef6e6896b4b4660bc7021bdc9159db9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dezajok/54677816654.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/faizabad_university_phd_form_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/inference_worksheets_9.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/34111818184.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_9fbfe5e9fa504b24be0f1e269cdd5c11.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/gcf_worksheets_grade_6.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_off00012098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12098 5396 bytes
SHA-256: 9e6c55ff24f00c34868107a4c813369838a8718b38bf6857c448ed47fa464ac9
font_01_sfnt_off00013301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13301 2360 bytes
SHA-256: 13720d632ccc96dc522a1da0630548069e09e5c5781557efecca79f31305fb57
font_02_sfnt_off00013d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6F 11500 bytes
SHA-256: 24c62afcb3681894abf6715c9567da9d05d10d5bbcbc9f63c66a141ce70d52c6
font_03_sfnt_off000164d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164D8 16168 bytes
SHA-256: 8c1e3298cb301b6aa2c2aeff0a89e1cafee6626e56d5ffa98ad52a7598c40df9