Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a21c33809472ce5…

MALICIOUS

PDF

83.3 KB Created: 2021-03-24 06:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 124708a350e95267017d352fe848d582 SHA-1: 2ac400c718f31122de2261aeafcbc7b5f795ca32 SHA-256: 3a21c33809472ce51e03878749dfaf8cd72114d64861f700dfd4c7bf8f20b5be
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-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.
  • 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://soxebez.ru/strik?utm_term=python+list+comprehension+filter+lambda PDF link annotation
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/zuvomolijezej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd679dd07aa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383689/normal_600f5b4e6b6ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368224/normal_6050dc33b730f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_601bfb7cbdb90.pdfIn PDF document text
    • https://cdn.sqhk.co/vomifavafo/dWicwjh/robbery_bob_mod_apk_hack.pdfIn PDF document text
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/pomiluwamevutaxubixu.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/jjggdjb/dj_marshmello_mask_amazon.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/64d42da6-9bc6-44a7-8b12-12642a40cacc/kesigilanujuwunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d013a48-e6b1-4c39-9097-8f3fc037d581/lock_pick_set.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/rafitepif.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/jelazafukinigewugomufudu.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/21196461075.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/abdul_kalam_biography_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013718eb-1cde-44b4-a9dd-2bb483192fae/26043268812.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/the_umbrellas_of_cherbourg_violin_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16ee22e5-c8c8-4b4e-9d27-91d40856dbfe/tm_tt_truyn_kiu_ngn_nht_vietjack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c77de3a-e7a1-4628-ba54-e6ff26ffe9e5/math_formulas_to_remember.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_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 2252 bytes
SHA-256: 58c525b9d2683ca74c98458b36e73b885416e752f12919397480847be2ddb55b
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 5640 bytes
SHA-256: d4d62ae2d146ff4763cada5f6c2f1ea6176b6caeba881782d760f15517073043
font_02_sfnt_off00011cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB0 10212 bytes
SHA-256: 08ba797d2dbb2bb95a9084b670d7e6a06852496eb4581355201f22daf998b863

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