Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e97ca79857b63b…

MALICIOUS

PDF

66.5 KB Created: 2021-03-25 01:54:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edbd94dc853779329698fcd7384ee674 SHA-1: e9ca7b94b2e1511822bf1a9a87bc5b189134bc24 SHA-256: 81e97ca79857b63b1cafb30d5fc976631eb48c3498a0860fffbb1cf4329c9139
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a malicious domain. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a popular product, suggesting a targeted phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=minecraft+creeper+plush+bank
    • http://lenulari.mypressonline.com/26642661610.pdf
    • https://static.s123-cdn-static.com/uploads/4471236/normal_5fcbf18656d59.pdf
    • https://cdn.sqhk.co/titabofasika/hbNRgp8/picwords_2_answers_level_16.pdf
    • http://botanilix.mygamesonline.org/best_careers_based_on_strengthsfinder.pdf
    • https://cdn.sqhk.co/juzilolawu/gfrihja/82866892678.pdf
    • http://kufomabid.mywebcommunity.org/21265460516.pdf
    • https://cdn.sqhk.co/bumajanivosi/EOgigiU/burigevefovuvogelo.pdf
    • https://cdn.sqhk.co/daposofoxig/gdZGgfx/78874651430.pdf
    • https://static.s123-cdn-static.com/uploads/4367960/normal_5fc620434716e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc776045-0e26-4efb-b17d-23c7e6c8d098/17837450322.pdf
    • https://uploads.strikinglycdn.com/files/218d3a93-386a-4304-b41b-7526c2e4a1ee/whats_another_word_for_young.pdf
    • https://uploads.strikinglycdn.com/files/81f147bc-9a13-4744-ab03-800dc537f7da/19529689868.pdf
    • https://uploads.strikinglycdn.com/files/408c9bd3-fc6e-46f1-afc4-1b51ec896d6c/suwixukafavumububu.pdf
    • https://uploads.strikinglycdn.com/files/2a112462-38a4-46c6-b3d9-8ead40bfb4eb/set_for_life_scott_trench_reddit.pdf
    • http://sivikonalijuto.myartsonline.com/90031078788.pdf
    • https://uploads.strikinglycdn.com/files/6bebc1ec-bc56-43eb-bba9-bde1b02ecd75/fairy_tail_season_1_episode_30.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c570.bin
e8dc2d2539d48c5653460e0dc17290a1ff6a7ebe5e337e68cbb136db2dc7d101
pdf-font-stream PDF embedded font (sfnt) at offset 0xC570 5312 bytes
font_01_sfnt_off0000d787.bin
36639a54d663d852e75ad6d8983b65ba08e3f8241b33519d1e2a846c9843be90
pdf-font-stream PDF embedded font (sfnt) at offset 0xD787 11200 bytes