Malicious PDF — malware analysis report

Static analysis result for SHA-256 137e9fe82e410178…

MALICIOUS

PDF

77.9 KB Created: 2021-03-05 02:19:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4b50663fc659219280e77450a5c9eb91 SHA-1: a1958bb9c02111c605f35fd88366950a37f8c377 SHA-256: 137e9fe82e41017866013d1c71c62a9401b4884e50f29c5bd19eba110c014612
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 pointing to disposable hosting, indicative of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via the linked content. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external resources.

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/award?keyword=sniper+training+california PDF link annotation
    • http://palikexifumalam.mywebcommunity.org/53085847255.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/4403965.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/b17db.pdfIn PDF document text
    • https://sixojatem.weebly.com/uploads/1/3/4/6/134650300/welewariru-nenopokozuziw-dagim-rogufakikaviz.pdfIn PDF document text
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/pazoxanumepiwutowe.pdfIn PDF document text
    • http://tufofol.medianewsonline.com/first_stage_of_human_evolution_brainly.pdfIn PDF document text
    • http://didazema.mypressonline.com/86166105361.pdfIn PDF document text
    • https://gobodozi.weebly.com/uploads/1/3/1/3/131398455/baxedotojipetixo.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/jakili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_ab912b264adc4155963186d9c74d2dde.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_53ebfa0d3c4243fb929e8d61c92b2b0f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad6af2c-a86c-4eb9-85eb-0c6ec227bf2a/canon_eos_200d_mark_ii_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da7f1e1-2a43-4fda-a665-1486f8933790/gizerexexizaxagetape.pdfIn PDF document text
    • http://lojibovel.myartsonline.com/what_are_the_components_of_a_functional_behavior_assessment.pdfIn PDF document text
    • https://7e079b21-6cfc-4bbc-a8af-001f4930a7f2.filesusr.com/ugd/f66805_bfc168e4a70a4aca8a71951404558a27.pdf?index=trueIn PDF document text
    • http://zagofij.onlinewebshop.net/muvogexevo.pdfIn PDF document text
    • http://xibupafuvobiluk.rf.gd/14291187148.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfd10a2-296c-4168-91f3-d418c895d4cb/triangle_offense_management_company.pdfIn PDF document text
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_6dd52c7ef6454f49ac75c02d0b13265c.pdf?index=trueIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_c5d22d4a05a545eb8b2766e7bcb01c2e.pdf?index=trueIn PDF document text
    • http://golofupatawef.epizy.com/haida_gwaii_fishing_report_2018.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_off0000f2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AD 5108 bytes
SHA-256: 8c7f3cc403717a74ffacbad40587c581aac6a74fe0f9fd21ff215e5e3e35c0f9
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 11300 bytes
SHA-256: ab8db1e6c509ece7a6b1b805884f732efe8a30ea08e88f71c99c5096502b14f4