Malicious PDF — malware analysis report

Static analysis result for SHA-256 da28852d847ee382…

MALICIOUS

PDF

98.0 KB Created: 2021-03-03 18:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5129311c98c5d4f5c7d58b8d40e811c2 SHA-1: 57fa06d391cc9429a8e000d254498c66ab14946a SHA-256: da28852d847ee38257e29c06d1c26775deb94cd5fac1835a9275100aab57edab
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique commonly used in SEO link farms to manipulate search engine rankings or distribute malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown URLs strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, indicating it's likely a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://seumenha.ru/strik?utm_term=dog+man+grime+and+punishment+read+online+free PDF link annotation
    • http://mini-cam1.club/afnor_afaq_formation_professionnellek25bv.pdfIn PDF document text
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/fa9c0cdc7.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/9478871571kgqkf.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/158d4a1c5afcac.pdfIn macro / runtime command snippet
    • http://car-test.pro/881103286323z556.pdfIn PDF document text
    • https://cdn.sqhk.co/bonosexov/bif5ibQ/face_changer_app_download_uptodown.pdfIn PDF document text
    • http://kfnwejfnkwheklf.space/industrial_revolution_documentary_worksheet14lnm.pdfIn PDF document text
    • https://bovejivisesuja.weebly.com/uploads/1/3/1/3/131384116/zerevuloxa.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/tres_niveles_de_prevencion_de_las_enfermedades.pdfIn PDF document text
    • https://wofudanizosaxig.weebly.com/uploads/1/3/1/6/131637209/wadodojipawedob_lajofepefi_xokujawo.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/gjVT6hi/fox_news_live_stream_free_without_cable.pdfIn PDF document text
    • http://perevod24-card2card.site/chapter_6_chemical_quantities_review_sheet_answerscy5rd.pdfIn PDF document text
    • https://kojovade.weebly.com/uploads/1/3/4/6/134681743/4874868.pdfIn PDF document text
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/4636796.pdfIn PDF document text
    • http://bettyloustintruckbbq.com/94In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/41997516661.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/83833681945.pdfIn PDF document text
    • http://jisijuvod.myartsonline.com/windows_powershell_v1.0_virus.pdfIn PDF document text
    • https://s3.amazonaws.com/guvovigo/79564040557.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/gateme/maine_dil_tujhko_diya_songs_ming.pdfIn PDF document text
    • http://gixopiv.onlinewebshop.net/is_the_28_day_keto_challenge_worth_it.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/vepekomuguwukabobi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 5456 bytes
SHA-256: 11b515fbae333cba19c72e3426ef674b519e1b1701037f9d8ac7c34259726e51
font_01_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 2424 bytes
SHA-256: 7bbf23dc99357b08c8774768c3dbc7ae8500547291b916100cd6962652c93126
font_02_sfnt_off00013820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13820 13464 bytes
SHA-256: 80ee1c3d9abe0fa6dcf1a7dc3bc161eeab43c2b38b83b3b2937c14990ba60dbd
font_03_sfnt_off00016310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16310 16064 bytes
SHA-256: e456b5595f6e624407e10960d432782794320480929f7deed69280b081edb597