Malicious PDF — malware analysis report

Static analysis result for SHA-256 440130294eff4ee9…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 05:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 37b73b902eae7c1bcc600076d9ecc662 SHA-1: b110e590b001e42ed8d0a1d648bcbcc689f14439 SHA-256: 440130294eff4ee924b065f6db4513589bf487fc4f620fd5ed13adefc0953e79
126 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious or unwanted content, likely as part of a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://vilenefex.ru/wix?keyword=sonos+playbar+user+guide PDF link annotation
    • https://janodiwuzujemux.weebly.com/uploads/1/3/1/3/131382133/54b1c.pdfIn PDF document text
    • https://kewegiru.weebly.com/uploads/1/3/1/4/131438086/02e59.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/dca679cca30c.pdfIn PDF document text
    • https://puxizabub.weebly.com/uploads/1/3/1/4/131406372/bipawa_kuvojaxutojox.pdfIn PDF document text
    • http://mujezixebu.22web.org/wazubukogifi.pdfIn PDF document text
    • http://nutigunejome.22web.org/truenoord_annual_report.pdfIn PDF document text
    • https://zovarufegurer.weebly.com/uploads/1/3/4/6/134625168/a9df3388.pdfIn PDF document text
    • http://kemovarudowitox.iblogger.org/1078820248.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://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_99c4fc7432664462a594bd8fd94e9303.pdf?index=trueIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_8971ed4399844dc2b252104f91a9a758.pdf?index=trueIn PDF document text
    • http://mogikujerezegu.epizy.com/zodifazelevama.pdfIn PDF document text
    • http://topetovafaja.rf.gd/gym_jones_workout_program.pdfIn PDF document text
    • http://xefalisudowitab.epizy.com/voxalulifodudapanigoluli.pdfIn PDF document text
    • http://jifelig.epizy.com/simple_past_tense_passive_exercises.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_ad899b095e9b432a9564f4dabc5b53c3.pdf?index=trueIn PDF document text
    • http://duxejuxaxeze.epizy.com/in-_built_ionic_template_list.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_5f02ff2a844c4b79a38f7c64ea1b5b3f.pdf?index=trueIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_fde448d052f941ddaf3432a909dabb47.pdf?index=trueIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_8c1addad3c294bd0ae2a2cee31afed55.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_9f808d1467824c4db0b2833d404dd70e.pdf?index=trueIn PDF document text
    • http://koxosam.rf.gd/asterix_le_gaulois.pdfIn PDF document text
    • https://083189c9-8220-4687-a375-57be19a37228.filesusr.com/ugd/909b15_0cc2eaf52b7b42a6a31962773adaeb0d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE847 5272 bytes
SHA-256: bef2f0e64b1a08774f5ccfcb2881dc734e1e48ff2888a6dd921ad22f5b682713
font_01_sfnt_off0000fa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 11292 bytes
SHA-256: 2e2a022a051e3120e14e4146f80e027f6bee5c47bd964e65e7c2a54f310d1a3d
font_02_sfnt_off000120b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2