Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b552c06156f255…

MALICIOUS

PDF

73.5 KB Created: 2021-05-23 16:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4da65f76e3d7613da9056fa74ebabf50 SHA-1: daf2998d9db876c40551fc8b29d6e034729fb551 SHA-256: 76b552c06156f255532d73bf5ee413f709a14eecd30119cc38bade1d90997b74
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 0.9998

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://seumenha.ru/strik?utm_term=aircraft+spruce+katalog PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5ffe1aa86f96c.pdfIn PDF document text
    • https://toxavepudu.weebly.com/uploads/1/3/4/6/134634724/9766770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_606d95636b0ab.pdfIn PDF document text
    • https://vapotilixivurok.weebly.com/uploads/1/3/0/8/130814345/67bf69a5ea8270.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/rekorewexidiwo/filezilla_3._30_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/xbox_video_player_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1708de8-c55a-4de7-a229-a44cbc45146a/how_to_write_no_objection_certificate.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/32159530766.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/frozen_full_movie_in_tamilyogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e485706f-b26f-4d31-856e-88fb5d5b3ad2/xutazuloluximetulubak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8c2a13-19a8-464c-b1c6-4adce487679b/4_pictures_1_word_level_2360.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/83269208029.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/cfpb_hmda_small_entity_compliance_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/story_of_seasons_cooking_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gekojulog/apple_music_android_to_sd_card.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e0531c-40a8-47a6-b007-5b9c5ff3cdcb/how_to_connect_wireless_headset_to_cordless_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/ayushman_bharat_yojana_card.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/24307219218.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/lunazewifaderefu.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_off0000e285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE285 5236 bytes
SHA-256: 6d8e8cfcd73f038dde422353af44132e39fe0e4e1fc77b5c25197636c18c04e3
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10812 bytes
SHA-256: b065da1dfdc737bc8842d1d096299ccdaf0e3add1a291695c9092e23ae3be84e

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