Malicious PDF — malware analysis report

Static analysis result for SHA-256 f936b00bf99417cb…

MALICIOUS

PDF

82.9 KB Created: 2021-03-03 19:38:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f724c9b04d76cdddf3c6ffa62a24658 SHA-1: 5a78606b70c1d504575b7076908c0abfd425a3f1 SHA-256: f936b00bf99417cb1ae9c6947a255adce487ddd12de85f67360e8ca6f5a15fd0
154 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including a critical finding for a link to known malicious redirector infrastructure. The embedded URL points to 'dafemum.ru', which is likely part of a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and malicious link suggest an attempt to redirect the user to a compromised or malicious site, potentially for credential theft or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://dafemum.ru/wix?keyword=substitution+method+worksheet+easy In PDF document text
    • http://nebemor.mywebcommunity.org/66255685031.pdfIn PDF document text
    • http://xiruzox.mygamesonline.org/8584330221.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/how_to_install_britax_boulevard_front_facing.pdfIn PDF document text
    • https://cdn.sqhk.co/rufopunuk/g6xfoTn/voa_news_s_sudan.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/what_is_the_plot_structure_of_a_rose_for_emily.pdfIn PDF document text
    • http://wemuwetafivaxe.sportsontheweb.net/whats_dating_mean_to_you.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/oraciones_cristianas_de_guerra_espiritual_por_los_hijos.pdfIn PDF document text
    • http://sivelural.mygamesonline.org/naxerorog.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/41798450642.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/pitney_bowes_postage_meter_instructions.pdfIn PDF document text
    • http://arfesopt.com/photo_collage_template_photoshop_cs5ppxl5.pdfIn PDF document text
    • http://fitdieta.com/gokivoderik24wp2.pdfIn PDF document text
    • https://cdn.sqhk.co/pewesopefim/iiijf6S/breadwinner_cafe_menu.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/wunojipu/84872310955.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/jimeb.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/petsafe_wireless_dog_fence_instructions.pdfIn PDF document text
    • http://wudemexa.myartsonline.com/what_store_sells_check_registers.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/31194235837.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/suvumigekugerevitori.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 5536 bytes
SHA-256: 7496ae643449864a902e9e5c7e9fb1522f1faa83d7500c4bad5179786925dd73
font_01_sfnt_off000104bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BD 10672 bytes
SHA-256: 191d7659ecabf322990b8fa86cda4281f82e173c3aa6cfe53157bf995b601979
font_02_sfnt_off00012984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12984 16060 bytes
SHA-256: 713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74

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