Malicious PDF — malware analysis report

Static analysis result for SHA-256 682e57917fa0fc23…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 03:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 737391863d6b090be1cf2ffa932b4311 SHA-1: c850916b4fd8a7586b6192360405dd0ae4f2aeb8 SHA-256: 682e57917fa0fc23efdf660cdf575276bf09ea123cdf054fd43feaf60d22c569
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a tactic of redirecting users to malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=4th+grade+grammar+lessons+pdf PDF link annotation
    • https://cdn.sqhk.co/xawodoze/jhjjhoD/nuluvagikuwuvev.pdfIn PDF document text
    • https://cdn.sqhk.co/fafovewidom/ha9iao9/slots_online_with_bonus_free_spins.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/fRhgicC/starfall_calendar_learn_mathematics.pdfIn PDF document text
    • https://dimavuvinidet.weebly.com/uploads/1/3/1/3/131397938/8d71cd5492ccf.pdfIn PDF document text
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/tudafameg_pikan.pdfIn PDF document text
    • https://cdn.sqhk.co/wovegase/UgPSc2w/botabikoloveko.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/iiAC2v7/temple_run_3_online_game_free.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/xeripege.pdfIn PDF document text
    • https://cdn.sqhk.co/luwibajik/dihqpje/37130831106.pdfIn PDF document text
    • https://wopirizebopate.weebly.com/uploads/1/3/1/4/131452778/4749659.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/81113825959.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/4hgBgji/juxobebalufiwafezekuti.pdfIn PDF document text
    • http://zixivudu.getenjoyment.net/67922174478.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/79242804117.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/zmBhjgj/89070991430.pdfIn PDF document text
    • https://jupojunidukeze.weebly.com/uploads/1/3/4/0/134012404/lopixor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_2f225f777d59458a8b340f9f3e6b40a5.pdf?index=trueIn PDF document text
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_a5a2b0522c154c0b9e70e67829d1bcbd.pdf?index=trueIn PDF document text
    • http://butomepa.rf.gd/beatles_songs_chords.pdfIn PDF document text
    • http://vigukesege.epizy.com/26845983738.pdfIn PDF document text
    • https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_f4d96991b1004774959bd08681a75f90.pdf?index=trueIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_7f19ae6e067e4dc4bab13b42746de78d.pdf?index=trueIn PDF document text
    • https://e4dd5bf8-bd13-43e3-b37b-9624b2564f03.filesusr.com/ugd/093416_b0c5cb6296234d36b06974a1f8098775.pdf?index=trueIn PDF document text
    • http://bodirinukamole.onlinewebshop.net/bocio_multinodular_eutiroideo.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_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 5448 bytes
SHA-256: 716c493295ee72530729cf7c0b416dc586ba37c9da5236d4ebc8cde30e5c9167
font_01_sfnt_off0001048a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 10968 bytes
SHA-256: a2a857758783b863d687c3b7dbc795b18ffeeb36daed24dfc1df73483c5729ce