Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71f898b551a2d13…

MALICIOUS

PDF

87.5 KB Created: 2021-03-15 02:10:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef33614627e730dda9b81f1b914531eb SHA-1: 15b04e7209e33dbb0e0963ff27fe98a2b8ea2cb2 SHA-256: d71f898b551a2d13d02f1fd0143e61168aa3a2a7be5f4d0154887174464726ad
156 Risk Score

Malware Insights

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

The PDF contains a link farm and an external URI pointing to a suspicious domain, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=car+air+conditioner+condenser+fan+not+working
    • https://cdn.sqhk.co/fufigavaki/tjcxhb7/79991677066.pdf
    • https://cdn.sqhk.co/gepeduvo/jigehcf/xozufewevorinegaxokep.pdf
    • https://zodaribidibukez.weebly.com/uploads/1/3/4/7/134716266/taporeseg.pdf
    • https://tunutepefa.weebly.com/uploads/1/3/1/4/131453603/velisopokib_tiguxititoziwo.pdf
    • https://cdn.sqhk.co/mewivupa/jcb50rn/38917957117.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_5ab19bcadb9a4e04836192f8ca0b25cc.pdf?index=true
    • https://s3.amazonaws.com/viromibukoleliw/corded_home_phone_with_answering_machine.pdf
    • https://s3.amazonaws.com/pexodugosa/30007013356.pdf
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_31175f2a901749beb329da4f32718bfc.pdf?index=true
    • https://s3.amazonaws.com/najubu/bsd_education_full_form.pdf
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_2778e27ae2d7441cbbdbc391d97420de.pdf?index=true
    • https://s3.amazonaws.com/dosalapasenow/android_9_pie_motorola_z2_play.pdf
    • https://s3.amazonaws.com/ganubifirigevi/characteristics_of_formal_organization.pdf
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_7a3e649ba115448ca63231e6ce7c9126.pdf?index=true
    • https://s3.amazonaws.com/jimugivos/centring_sheet_manufacturers_in_hyderabad.pdf
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_2775817c5cf4423996aa54d6728cb033.pdf?index=true
    • https://s3.amazonaws.com/jivuxo/50807130808.pdf
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_701e39bbee694eb4a1cc1346831d2a4f.pdf?index=true
    • https://s3.amazonaws.com/kezemiradigu/fluke_1507_datasheet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c9.bin
ded3a207f9235bf458c4ed3270bb2303d180a027ba60e8398727be9a7f10b816		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C9 5124 bytes
font_01_sfnt_off00011b59.bin
529d57714967376155dea4dccc9cd5886002752882ac8eedeb15234944325329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 11504 bytes
font_02_sfnt_off0001426f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1426F 4324 bytes

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