Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f93c3fcea9d80d…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 17:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9ee44c4873a235677eaff090f5b3ab6a SHA-1: c1f0af3d3310dcb2e4a28ecfcc8d1bd81fa34144 SHA-256: e1f93c3fcea9d80dba548c4f297d2f14c094c60e0f78ced1d3f121c5e09e77c0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous external URIs, with a significant number pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=the+battle+cats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482405/normal_604b2536cd2c9.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/jurnal_burung_walet.pdfIn PDF document text
    • http://7lessons.website/28256287947pnwja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fca92f4bb206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455405/normal_6018c83c05a8d.pdfIn PDF document text
    • http://jofufunobek.sportsontheweb.net/how_many_carbs_to_eat_on_diabetic_diet.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/punitaxasudepubalidaro.pdfIn PDF document text
    • http://tryraisins.club/love_and_respect_workbook_questionsrw4pt.pdfIn PDF document text
    • http://meinekarten.best/purugesizaxiwik0rp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374002/normal_5feed2cbe1475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_6051ab5d632df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_5fffd255d3c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380528/normal_60024993afbae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486982/normal_5fd15a4e43cdb.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/bolovopizonuki/manifesto_barisan_nasional_pru13.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/43861077814.pdfIn PDF document text
    • http://dijuvunote.onlinewebshop.net/79183435226.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 4880 bytes
SHA-256: 505b127aad08c1fa9b95e9df2ba32fd8b2a726bcb735b4495f3747a1642ff1c2
font_01_sfnt_off0000fbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD2 12432 bytes
SHA-256: 27802928f17aae1528c49a5149b1b15908ecc6d2a8d4ced5fac8926570bb8254

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