Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb3de54524ff874…

MALICIOUS

PDF

77.4 KB Created: 2021-03-27 11:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 325a48895f435fda2e33abf1887a32f3 SHA-1: 75a33b8ea51994a4f5140bfbd71ce357e4e9e538 SHA-256: bdb3de54524ff874623aadcd967645332591635329c776ac12ff871cfe5a27e6
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://dugedepap.ru/strik?utm_term=what+are+the+symptoms+of+seasonal+depression PDF link annotation
    • http://helpverifedbadges.com/27264692698shddo.pdfIn PDF document text
    • http://segwaywheelchair.ru/fujejubaromolama3sw2x.pdfIn PDF document text
    • https://dapalijika.weebly.com/uploads/1/3/0/7/130738969/bixupilab.pdfIn PDF document text
    • https://jupolojujilozas.weebly.com/uploads/1/3/4/5/134598947/17935ecff389bea.pdfIn PDF document text
    • http://sanelobazigi.medianewsonline.com/14447939651.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454808/normal_60003752ee993.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452199/normal_5fec684c44a44.pdfIn PDF document text
    • http://dobofozepop.mygamesonline.org/movonixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408188/normal_604f4e62e3e2a.pdfIn PDF document text
    • http://yogistika.space/nasofivigilegujokizonv8v.pdfIn PDF document text
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/subovopefaj-mubixifo-bibuzisorob.pdfIn PDF document text
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/1580242.pdfIn PDF document text
    • https://fabezetenonuke.weebly.com/uploads/1/3/4/8/134846610/2650656.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/cf947712-5af2-4347-907e-e4a9ac7fd168/toro_22_inch_recycler_lawn_mower_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192c86ae-a3ff-486a-8d06-0267f93fc8a3/wiwusitumab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f423050-f972-471f-81cc-ad50fca02e64/91050452069.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cf4391d-48ca-4389-935d-f218f05c4061/cuantos_huesos_tiene_el_cuerpo_humano_y_como_se_clasifican.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af21d20a-33fa-4865-829a-924dcdfd8fa9/dungeons_and_dragons_3.5_books_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae160428-1dd9-4e30-96f2-3df7c6433e5a/pokemon_red_map_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14d9ca83-0446-4fdf-bdd8-ca9c03521be9/america_a_narrative_history_10th_edition_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8166af-edb4-4159-98ba-56cfbd47afa2/lotukev.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_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 5396 bytes
SHA-256: 747189c39b9e2b466394731e3b17cbe5248f2390f09c706f76a4c8c3b3a575ea
font_01_sfnt_off000103cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CF 10660 bytes
SHA-256: 84023f3431a4368dd9833f1a8eeb55516f23af2fe6410a78d26d02580f559993