Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b8318c53f7633ef…

MALICIOUS

PDF

77.5 KB Created: 2021-03-08 03:08:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2fe13de3d08488ae134ad730b1dd7691 SHA-1: d3990e5f008a166fcac10859bb149876eb5395c7 SHA-256: 7b8318c53f7633ef4ff9510e1536877607ece0523977034774e192710882722a
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirectors and a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • 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.
  • 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=frigidaire+upright+freezer+repair+manual In PDF document text
    • http://fufejezonodim.mywebcommunity.org/bukinabowotaxizevoxuto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_601f9b45ecceb.pdfIn PDF document text
    • http://podonebatimekel.22web.org/report_lost_card_american_express_singapore.pdfIn PDF document text
    • https://cdn.sqhk.co/texirova/hijjghe/solusominojegoxeguwoki.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/hhsYQ7N/36076176503.pdfIn PDF document text
    • https://cdn.sqhk.co/givogaduta/gKjage1/22566070861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_602157be66a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b63ccc41bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fcb30ffba9ca.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/18296414886.pdfIn PDF document text
    • http://dexowowijovovu.iblogger.org/process_flowchart_powerpoint_template.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/gnX3vNV/weredakikorojafarotibur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_5fd161197f891.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/reinforced_concrete_design_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/kevovevude/Ejhlgg3/blackboard_mdc_login.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_8e56d05f4ac04c8ea9a7f95479f7e84e.pdf?index=trueIn PDF document text
    • http://dojokefopuxi.rf.gd/bakra_eid_photos.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/tom_sawyer_jackson_island_map.pdfIn PDF document text
    • http://ravesezubepad.epizy.com/64679774611.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/zizowuwil.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_7b64924a725640588213798e80f335b9.pdf?index=trueIn PDF document text
    • https://f538c46d-6aff-4997-95da-320e40b30403.filesusr.com/ugd/262ba4_88a314aae64d43599c7b6de51f107194.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/cardboard_rc_plane_plans.pdfIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_7cf261352e2e48dfb372eb69586223ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/25723062582.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_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 5284 bytes
SHA-256: daad9d553179e226fdac44aa4cd4e954597b6ffdbf3411863c27a7e4d8eb7c93
font_01_sfnt_off00010380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10380 10740 bytes
SHA-256: a4d8a8828f760057bc572883a38993f13bef291182f6cbbb3b9725305907f23d