Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9730e49625b552a…

MALICIOUS

PDF

77.4 KB Created: 2021-03-16 01:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 048cb1702427c072cbdf65061375859f SHA-1: bb9d095df2aef78409fb1ab7db423030095af6d2 SHA-256: c9730e49625b552aeee5478a16efa0be26950ce7550ec8c1ec1bf34c69f8e19a
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 pointing to disposable domains and Weebly-hosted PDFs, indicative of a link farm. Heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were extracted, the sheer volume of suspicious links and the ML classifier's high confidence score point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/strik?utm_term=bookends+movie+plot PDF link annotation
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/jezuzugepi.pdfIn PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/3b5b4f12d77.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/7387020.pdfIn PDF document text
    • http://xazapefunel.getenjoyment.net/79208397995.pdfIn PDF document text
    • https://webegerux.weebly.com/uploads/1/3/4/7/134759049/f435e00d11d27c.pdfIn PDF document text
    • https://jadipiruw.weebly.com/uploads/1/3/0/8/130814676/vologizepaboso_bejitepif_tiloxapofu_gaduramop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_603d518ece847.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/6191998.pdfIn PDF document text
    • http://pobesegu.scienceontheweb.net/kagufipiwajisopipuf.pdfIn PDF document text
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/6561514.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/vizio_m492i-b2_wont_turn_on.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453575/normal_6026c3dc8bc51.pdfIn PDF document text
    • https://wifevotus.weebly.com/uploads/1/3/4/8/134897576/9359027.pdfIn PDF document text
    • https://sepuzudagek.weebly.com/uploads/1/3/5/3/135329554/kilukabanizo-lusif.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/sowajejir.pdfIn PDF document text
    • https://sanofawuvi.weebly.com/uploads/1/3/4/5/134588151/tedipunofagiwa.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/37340140071.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5ffdfaf295660.pdfIn PDF document text
    • https://wumibatolazonik.weebly.com/uploads/1/3/1/4/131437616/rulomujude.pdfIn PDF document text
    • https://pigiburoletu.weebly.com/uploads/1/3/2/6/132695467/873049.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/16x2_lcd_module_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/worthy_information_in_a_sentence.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/55886446436.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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 4972 bytes
SHA-256: 24b5fa42eefa62f745a4fe3d673ee7cba2e1ed742b9ecbd3f9326de3f0dcfd85
font_01_sfnt_off0000fdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB1 13288 bytes
SHA-256: 13ce962cd6ac6dbef07c5cff43d703e4dc0a690c0353f0f9ba6b122c6e06a4e3