Malicious PDF — malware analysis report

Static analysis result for SHA-256 0455bb653d2ed5c1…

MALICIOUS

PDF

71.1 KB Created: 2021-02-22 14:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 938084aaecc4ff9637a7e438ebb1807c SHA-1: 23cec8815f3d9fdae65fbdc6b17e9b973439244b SHA-256: 0455bb653d2ed5c1f7bcf3f7a62376c630b2a28b103a3abd5d1b5afb87a5d76f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and Weebly hosting, indicating a link farm designed to redirect users to malicious sites. The heuristic firings confirm this behavior, with specific rules flagging it as a malicious redirector and a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern is the distribution of malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=what+are+the+requirements+to+be+a+secret+service+agent In PDF document text
    • https://jizesemud.weebly.com/uploads/1/3/2/7/132710762/4911577.pdfIn PDF document text
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/voxavaxox.pdfIn PDF document text
    • https://jofomozali.weebly.com/uploads/1/3/5/3/135387403/9179502.pdfIn PDF document text
    • http://auto-agents.space/novels_by_iqra_sagheer_ahmedvx40p.pdfIn PDF document text
    • http://yourbigdick.space/watch_bruce_almighty_full_movie_free758on.pdfIn PDF document text
    • http://help-business-media.com/ski_doo_service_manual_free_download6pdmg.pdfIn PDF document text
    • http://creditactive.info/bigg_boss_season_3_tamil_songsgtlsi.pdfIn PDF document text
    • https://vugesajovor.weebly.com/uploads/1/3/4/2/134265649/badilo.pdfIn PDF document text
    • http://bunnygummy.ru/waveno04qnm.pdfIn PDF document text
    • http://leyloften.online/nazesakuxilujatojamekejitlmlbx.pdfIn PDF document text
    • https://batezumepew.weebly.com/uploads/1/3/4/4/134479003/mesag_botanoxebak_logaxekebiboduj.pdfIn PDF document text
    • https://gepumisi.weebly.com/uploads/1/3/4/5/134517510/9091092.pdfIn PDF document text
    • https://kapokifi.weebly.com/uploads/1/3/4/5/134510442/vuzuteg-jegopesikegepe-wulubadivuvixu-tenobe.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/baxekojojexusol/gunaxoleve.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/89057879806.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/facebook_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/57537612818.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_off0000d9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DF 5520 bytes
SHA-256: bfa910bd00518c0822adb6ecad649d75701032bd0dfdb8c5bf207f8dd17132f3
font_01_sfnt_off0000ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8F 10220 bytes
SHA-256: c23e741a79bcb94216634f4feec1158e80bf6e8a06fa71d6a71fe0e26e3d098a

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