Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a81f5c75e36f38…

MALICIOUS

PDF

71.4 KB Created: 2021-03-14 13:36:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 60d271f80b52ef50ef851282f5400604 SHA-1: bbb7796784c68ffd71b08f9906ea7cb2aa83b997 SHA-256: 40a81f5c75e36f388ad176f5ebd79de529ff1fde4638f427679771dc43175fc2
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on suspicious domains or are part of a link farm, suggesting a phishing or spamming attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to PDF to Word conversion, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/award?keyword=convertir+de+pdf+a+word+online+love PDF link annotation
    • https://cdn.sqhk.co/mamidusidozu/0gijeu7/new_stickers_funny_cartoons_wastickerapps.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/biology_science_for_life_4th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/jadojibam/p5vjigg/22250301550.pdfIn PDF document text
    • http://rirelavemug.iblogger.org/wufuve.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/gobosulelo.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/ilghZAT/guitar_sounds_tinny.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/2032485133.pdfIn PDF document text
    • https://cdn.sqhk.co/wemerofada/jhiOibj/american_survival_guide_magazine_free.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/kubedukowug/urinary_catheter_types.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/nidugelawan.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/scottish_household_survey_technical_report.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/counter_strike_1._6_bots.pdfIn PDF document text
    • http://mugazukadum.onlinewebshop.net/how_to_make_your_own_playdough.pdfIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_15ad1a250a824c14a70709eaaf8edf67.pdf?index=trueIn PDF document text
    • http://vamavaremimot.atwebpages.com/assimilatory_and_dissimilatory_process.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/bejuzobogif.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_8284f604bee84fc98385128202e89c0a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/doble_kara_song.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/8717317056.pdfIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_e18f6e8ed3ab4db5a0d04131bd4dbee7.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_cd63696ae83c458abbdc35b40a81e282.pdf?index=trueIn PDF document text
    • https://73b3f487-90f5-41a6-bf44-750372f72efd.filesusr.com/ugd/39e8d0_af8a7d73324540169daeb2a878b6ae01.pdf?index=trueIn PDF document text
    • http://dulasugemekiv.epizy.com/1580777581.pdfIn PDF document text
    • http://fowagamop.rf.gd/books_free_download_novels_in_urdu.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_off0000daa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA7 4912 bytes
SHA-256: 919741265bf985efb0551660226e0821f55180cb19efe04d17368b233267185c
font_01_sfnt_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 10556 bytes
SHA-256: 699f6e3be9aa8452c437e0eb16a712bc5a623895058b0660ae6e01e5ccbe923b

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