Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7ed1ecff97ea04…

MALICIOUS

PDF

75.1 KB Created: 2021-03-23 05:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cd3f180f57be84a518a1fd636f2d3007 SHA-1: e0c04455842120c35144611ed514a7f9636701ee SHA-256: cb7ed1ecff97ea04378bc5d53b099fc7c11033e38948b80cd330c0207c5370bf
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/123?utm_term=bresser+wifi+camera+manual PDF link annotation
    • https://motadali.weebly.com/uploads/1/3/4/3/134368257/c3df2fad67eaaa.pdfIn PDF document text
    • http://powerpoint4you.ru/starcraft_remastered_download0ef2x.pdfIn PDF document text
    • https://wovovude.weebly.com/uploads/1/3/1/3/131397940/1da80b3.pdfIn PDF document text
    • https://mimatetozolo.weebly.com/uploads/1/3/4/7/134707120/f062a.pdfIn PDF document text
    • http://geleostone.online/70218870590v1pod.pdfIn PDF document text
    • http://complect-tech.ru/how_much_does_cyberpunk_2077_cost_at_walmartn8tqi.pdfIn PDF document text
    • https://daxogane.weebly.com/uploads/1/3/2/8/132815110/vopokirav_wuxudeze_salejegide.pdfIn PDF document text
    • http://helpcreditscore.info/95025276349v2t7a.pdfIn PDF document text
    • https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/464165.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/baf859a7-98af-4a77-bbfa-0e366561d8ed/essay_writing_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/are_self_cleaning_water_coolers_safe.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/chittagong_university_admission_circular_2018-_19.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/dnd_5e_homebrew_class_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/5_tab_clear_label_divider_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/pcr_full_form_in_school.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/givodisurapozotox.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/45691029840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98158b06-5542-45b3-a03f-0c435acfa900/matlab_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8e1894-bfc3-4f30-ba78-9d46220353a2/33498817015.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/zugud.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 4120 bytes
SHA-256: 1256ec8e5b3f027ceed9fb809a3bc062e83fc5cf6bc8ec09b458fc612af062eb
font_01_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 5168 bytes
SHA-256: 2ddd4d7d19f79189197282b1d99c8325a4772477c0fef9cbd434b0ef979441f6
font_02_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 12456 bytes
SHA-256: f31acf11fb4e9355f47548095b6915e46a4a6a84a41e897e5b438efdbcecbd5c

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