Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfab92cfacbdae9…

MALICIOUS

PDF

77.3 KB Created: 2021-03-06 20:28:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0f3a8239a99f6093933cdb6d131c3b05 SHA-1: 56fb37da4d57f88dbb463a589abebfe64aaaee23 SHA-256: 3bfab92cfacbdae93a12595ebfc2c82084b201fe29db48ef3cacb2f4305e2a6c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is disguised as a search result. This indicates a phishing attempt to trick the user into visiting a malicious site. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://yafferge.ru/strik?utm_term=how+do+you+change+the+battery+in+a+roomba In PDF document text
    • http://cuzinfo.ru/9513973510pjaw0.pdfIn PDF document text
    • http://899themes-demo.ru/whatsapp_free_iphone_5strqve.pdfIn PDF document text
    • http://siteznakomstv69.space/ccrn_review_book9kvxg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5ffdefe04f06c.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/what_is_dataset_object_mcq.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/26879466323.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489969/normal_5ff46059053ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18482b1-5fc3-4700-803a-d3da20a4ac6e/10410401929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd51a2b7-0d7d-49bd-a361-20c98fdc834a/78694297499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7026f36a-20e1-4080-8f62-76b1c8ddbc42/26448011267.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/rastafarian_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/lolek.pdfIn PDF document text
    • http://najukelosuned.myartsonline.com/mini_protean_tgx_stain_free_gel_bio_rad.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/93159424208.pdfIn PDF document text
    • http://bitines.myartsonline.com/kedaganifurinaxum.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/ruzudusababajite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5ca1bf8-fc6e-4bcf-8956-8ecce7db3e83/82714507193.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9669ee88-9108-4e84-925f-94773c0a891e/sekamevuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/a_g_c_r_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/angular_6_search_form_example.pdfIn PDF document text
    • http://zewadomi.myartsonline.com/tufifirixosexuvufufuso.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/koxijudowoxaros.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/gokegokopasedevatimegali.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_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 5440 bytes
SHA-256: 216370845bb7a5ffaf6e45cc1b54eb36c9666ffc3c7f47438055e23ef23396d0
font_01_sfnt_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 10520 bytes
SHA-256: a72ceedc8f9a5edc70def086dab84a0d25790507e15b9ca528706c3cf87a4ccb

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