Malicious PDF — malware analysis report

Static analysis result for SHA-256 3455d2c5708506f7…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 08:51:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d2178f22db2b45fdcfc1f5e4935bd03 SHA-1: 3059d7e7f568116bf624cc78992c1a1e21028fd9 SHA-256: 3455d2c5708506f7debb95d8471f2b1bf0aa2876ffe7f3ba6a666fc92281d4d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical PDF SEO link farm detection and ML classification. It contains numerous external links, with one prominent link pointing to 'druttle.ru'. The PDF structure and the presence of many external links suggest an attempt to redirect users to potentially malicious or spam-related websites, likely for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://druttle.ru/award?keyword=supernatural+cast+season+2+episode+11 PDF link annotation
    • http://lafilubepojev.scienceontheweb.net/pivasijudi.pdfIn PDF document text
    • https://mixajogidevo.weebly.com/uploads/1/3/0/9/130969427/kuxaf.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/33451949524.pdfIn PDF document text
    • https://posoxoniboje.weebly.com/uploads/1/3/4/7/134713430/8395563.pdfIn PDF document text
    • http://just-gopro.com/58200087859q4vyw.pdfIn PDF document text
    • http://netewe8.xyz/lords_of_the_fallen_walkthrough_guidef8i3b.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/famazepigukowifexukuleb.pdfIn PDF document text
    • http://rolopigabetitu.scienceontheweb.net/what_is_base_rate_neglect_example.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/rozebofukixus/michelin_guide_chicago_twitter.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/watermelon_man_herbie_hancock_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/mojufakasezozitenuribojes.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/how_do_i_make_my_apple_watch_3_waterproof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1794d4c7-7fa2-4d37-9d47-44e71e2f27dd/class_11_pol_science_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f472e1b-337c-4cb9-88fb-894061d443e6/wewowu.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/destiny_2_chronicler_seal_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1080dfd9-79e0-40ba-b99d-f12130dff9c5/ejemplo_de_minuta_notarial.pdfIn PDF document text
    • https://s3.amazonaws.com/naxizugenabi/kamokudiwapozesub.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/45885163758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6e9af3d-b45e-4c31-9f16-f57f2d91b8fc/basic_guitar_chords_songs_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/32815307504.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_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 5352 bytes
SHA-256: 516f228001c0b181877798c36e8975d18f75e30e26f6859ab3d60f5108a0e2d0
font_01_sfnt_off0001053b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053B 10212 bytes
SHA-256: cffbcc0bf0fad3806db2554085e52b9564bfe58d766d97b1c1f1905b82675fe4

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