Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19da2c2a2cc4487…

MALICIOUS

PDF

77.2 KB Created: 2021-04-25 22:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cd860b653d61f0d6dc83cbd312ebcfba SHA-1: 90e43922104a3c8e1ef891aa1407fc744bfca3eb SHA-256: e19da2c2a2cc448716e11be481a4492cfefec985c8c3408e077a34555890dd74
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The document body, though heavily obfuscated, appears to reference academic content, likely as a lure. The presence of multiple external URIs and a high ML classifier score indicate malicious intent, possibly for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jacksth.ru/strik?utm_term=exercises+for+weather+and+climate+9th+edition+answers+lab+10 PDF link annotation
    • http://mivamoxejepije.iblogger.org/jodevozubel.pdfIn PDF document text
    • https://simakaxulov.weebly.com/uploads/1/3/0/7/130738785/nuzuxuzedaxabik.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/nomipetimabilokezore.pdfIn PDF document text
    • https://xigokujote.weebly.com/uploads/1/3/4/6/134649591/943ff047e06.pdfIn PDF document text
    • https://vexokefiveve.weebly.com/uploads/1/3/4/4/134494279/9710393.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/bug_report_to_microsoft.pdfIn PDF document text
    • https://pibiwija.weebly.com/uploads/1/3/4/8/134896476/c53341.pdfIn PDF document text
    • https://dixozetazexode.weebly.com/uploads/1/3/4/4/134472526/poladamubamimojipoju.pdfIn PDF document text
    • https://gabejopow.weebly.com/uploads/1/3/4/5/134597712/726386.pdfIn PDF document text
    • https://lowunipuso.weebly.com/uploads/1/3/1/4/131453219/lubowafafudidetoku.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/pefedalugokinokugab.pdfIn PDF document text
    • https://bubigijezifaju.weebly.com/uploads/1/3/1/3/131380429/xorokadaxonaba.pdfIn PDF document text
    • http://lesitegu.iblogger.org/minuet_boccherini_piano_sheet_music.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxokafa.epizy.com/21756918259.pdfIn PDF document text
    • http://redebalumu.rf.gd/pulmonary_embolism_diagnosis_nice_guidelines.pdfIn PDF document text
    • http://siberasule.rf.gd/gejonu.pdfIn PDF document text
    • http://sobilekob.epizy.com/gene_mutation_worksheet.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/kumuditanalamukubasozeler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71ebf94-7c4b-4c2d-81e4-b1ed2544cc3c/zivimajezerujov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2528ed45-c601-416f-b04b-3f42d48d3579/facebook_help_desk_usa.pdfIn PDF document text
    • http://xipudabokodem.epizy.com/athletic_body_in_balance_free.pdfIn PDF document text
    • http://mizotafadoroze.rf.gd/get_current_access_token_facebook_android.pdfIn PDF document text
    • http://fulawumobolofog.epizy.com/asbestos_awareness_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/337f19c0-0f91-4ef8-bb4d-75a13d638882/68720900244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c2088ce-8ee5-4d72-9b0f-f9fcb3db86cc/casio_gzone_rock_c731_charger.pdfIn PDF document text
    • http://mogerokefo.epizy.com/rubojanapiseduximanezed.pdfIn PDF document text
    • http://mizozibobekujul.rf.gd/33930073348.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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 5868 bytes
SHA-256: d8d40a30c679b0a5f7461a8b06e87c4901ccfc9ffdb5fc4387a7b3ff00c9291e
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 10480 bytes
SHA-256: d697d05b9683c97975744b1f4298383e76da60beb978436dc9e8994d62f5690c