Malicious PDF — malware analysis report

Static analysis result for SHA-256 98407c9926e9873d…

MALICIOUS

PDF

77.4 KB Created: 2021-03-17 02:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2777f19f67fa7c31387d8584d374c6be SHA-1: 35ccdd3bcefae4fca0a9fe054402302eaba26274 SHA-256: 98407c9926e9873df290ca00256ba82a52858bfcda5878a25cdc037d10bcff2f
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'nipisod.ru', suggesting it's part of a link farm designed to drive traffic to potentially malicious or scam-related websites. The document body, though heavily obfuscated, contains text related to 'ez bow maker instructions', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/wb?keyword=ez%20bow%20maker%20instructions PDF link annotation
    • https://fifusikusivupe.weebly.com/uploads/1/3/4/6/134638905/vuwinogo-sitotidaw-lojududagefu.pdfIn PDF document text
    • https://vizosajigu.weebly.com/uploads/1/3/1/3/131381839/lifav.pdfIn PDF document text
    • https://kuxiwapanipajof.weebly.com/uploads/1/3/0/9/130969705/611aa42.pdfIn PDF document text
    • https://jetapixivokob.weebly.com/uploads/1/3/4/7/134726526/5bf521f0d58.pdfIn PDF document text
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/2ec9f.pdfIn PDF document text
    • https://puvixote.weebly.com/uploads/1/3/5/4/135400279/d1b4a584.pdfIn PDF document text
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/74118.pdfIn PDF document text
    • https://roxobirunuj.weebly.com/uploads/1/3/4/0/134096027/5613815.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f59a52-589f-45a6-9efc-0cea3f457330/mojilovesavovini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7736799-aed0-43af-90a7-e224042fd290/zowimatat.pdfIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_efb2dffc977a44179b6ee3140f48ad6c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/801c6069-833a-4298-958b-f48f01a4deb5/how_to_resize_plugins_in_fl_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eff6f4ce-386a-4508-9725-eab9697a77d9/pojutexulituw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2642918-bde2-46db-b039-db00acfef062/42723157141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19bc44fc-8901-4552-9f1d-ed875bc8546a/dark_souls_2_wiki_knight_armor.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_16b0ee5babf549448c4dad8293b47e0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/55002125968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95ef541-7924-478f-bf43-e1bcfdac9e34/zubapaluxulurugoxaxudogo.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/butterflies_colouring_sheets.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_17b26ca738d64b2c86b33a026920a47e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/19584706728.pdfIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_330c4da48cee4693bc79ffc9cbbc6c34.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_a1ec4ed7a1314ad4b7b305973da1ba8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/android_studio_textview_bold_programmatically.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/81548651212.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_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5216 bytes
SHA-256: e0e3d9c1bb8031ed2645ec812f8816ebab14a02f4bb9ccdf35e7475c3cbb6835
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 10752 bytes
SHA-256: 20318c33285f3221c03b2d750da6b2322a727bd9b979684f73219757ec3da5ae

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