Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e33750d78c277cf…

MALICIOUS

PDF

167.4 KB Created: 2021-03-27 22:51:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b0955c04249f0bd2c983f628cf725a45 SHA-1: c3ecfc2f31b9c0d8301aebc49bc974ad5c46d02b SHA-256: 6e33750d78c277cf101d0f2c846af7189f193a1bdb8e571dc632f232563a76a2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and utilizing UTM parameters, indicating a likely phishing or scam campaign. The presence of external URIs and the 'link farm' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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 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://golowaki.ru/123?utm_term=mariadb+vs+mysql+performance+2019 PDF link annotation
    • http://save50.pro/ap_stylebook_online0guah.pdfIn PDF document text
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/970690.pdfIn PDF document text
    • https://gosesubamumu.weebly.com/uploads/1/3/5/3/135348433/5901189.pdfIn PDF document text
    • https://xiwulugizasu.weebly.com/uploads/1/3/2/7/132741433/kolobomavajojuk_nolix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373240/normal_6036cef299ff3.pdfIn PDF document text
    • https://kamaxogijiwi.weebly.com/uploads/1/3/4/3/134318873/1472068.pdfIn PDF document text
    • https://xokefinodoju.weebly.com/uploads/1/3/5/3/135316617/f9aca8ca78b63.pdfIn PDF document text
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/ketokuxu.pdfIn PDF document text
    • https://bixirugabo.weebly.com/uploads/1/3/0/9/130969405/gulipugejesi.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/blood_bowl_rostersq3436.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_6016fb6896f09.pdfIn PDF document text
    • http://habirovradik.ru/sugesovenifutevurbassj.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/5886376.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5fff3590606d0.pdfIn PDF document text
    • http://omshop.space/journaux_algeriens_d_aujourd_huir2rwl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kufazete/4152925319.pdfIn PDF document text
    • https://8de17e8c-b43d-4143-985d-773a0aa332b1.filesusr.com/ugd/01f6ad_2c90b0d020724e8f8a7399cec2f7197e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/resixexi/honeywell_thermostat_th5220d1003_installation_guide.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_f479c9d8fb624cb18660e5d1dd385d41.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_6c6210e0087f4d70b160c28121aebfd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/deled_case_study_in_english.pdfIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_2d91ac8ad3654631b083f501767bb364.pdf?index=trueIn PDF document text
    • https://b9b086bb-db5c-4c47-b99c-4ca3d8c772c1.filesusr.com/ugd/c090b7_3f490f66c242442e9e21da1089e29d84.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F1B 58644 bytes
SHA-256: 75dce429b514b581617c848841496285a46fafb7327d374eb3330e20885f4805
font_01_sfnt_off00023a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23A4D 6216 bytes
SHA-256: ef567a68ca358736a39e75f35682fc586c12dc887e7521894c67d80a780d5d51
font_02_sfnt_off00024f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F76 12624 bytes
SHA-256: 55098888c1f0caa445afdec1681e60ad695a7e35e6277bc4cdc8ab954c26ea95
font_03_sfnt_off00027ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27AE6 16332 bytes
SHA-256: 261745db5019a150f45477f42548f675316619310a0b95af34019add6adf455d