Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8548419389039d…

MALICIOUS

PDF

87.1 KB Created: 2021-03-23 03:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 22b5e4753fc1738d66ac642f1768d7c1 SHA-1: 94ddd83e3515fa883da715ae8ecb00e9fa894392 SHA-256: 7d8548419389039dfb89d19ea07829a345d0236fd115c4917e26a0ffbce1b31d
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. While no scripts were extracted, the structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cdn.sqhk.co/bupabumo/689njhh/hi-_speed_indoor_go_kart_racing_near_me.pdf In PDF document text
    • https://rugovisatef.weebly.com/uploads/1/3/2/6/132682701/tolizos_lovanosop.pdfIn PDF document text
    • https://cdn.sqhk.co/zoluwumenad/ig6hjhc/tunokojavuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451932/normal_5fd1769b32346.pdfIn PDF document text
    • https://cdn.sqhk.co/nebafori/tQgiCje/98405547922.pdfIn PDF document text
    • https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/f21d27643c.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/gjihhgj/goal._com_arsenal_latest_transfer_news_today.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5ff85c5e47866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485313/normal_602c442e58cdb.pdfIn PDF document text
    • https://cdn.sqhk.co/winanuwumovu/hhUwWje/makita_jigsaw_blade_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492880/normal_5feb4ad9c7588.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415331/normal_5fe17666439bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/0IJhScypsXo/wb?keyword=m%20audio%20keystation%2088%20power%20supplyPDF link annotation
    • https://s3.amazonaws.com/vonusirukete/what_is_the_purpose_of_narrative_text_and_recount_text.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/samsung_bypass_google_verify_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/pivuxuj.pdfIn PDF document text
    • http://mafilijesov.epizy.com/anexar_sei.pdfIn PDF document text
    • http://fugexumelelada.rf.gd/69044658121.pdfIn PDF document text
    • http://memugeb.rf.gd/what_is_the_setting_of_a_pair_of_tickets.pdfIn PDF document text
    • http://gapowap.epizy.com/manuale_blender_2._79_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/estadiamento_cancer_de_colo_uterino.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/66981953753.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/asce_permeable_pavements_recommended_design_guidelines.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_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 5412 bytes
SHA-256: 585b0a135afbe861c6c37c4b04acc65f8621644e9effaa0dbbec5eb616cb650b
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 10636 bytes
SHA-256: 6efcec33ebb3b7cf511669555c599bbf2956a782db411e25b4fecfe4d3382b87
font_02_sfnt_off0001396c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1396C 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953