Malicious PDF — malware analysis report

Static analysis result for SHA-256 524a067556678046…

MALICIOUS

PDF

72.8 KB Created: 2021-02-06 21:42:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9389017786371f61e418b6e45f787088 SHA-1: abbaad77356c807dae6f58f5b721c43cba9190d1 SHA-256: 524a067556678046f44b98dd4b1ce689d41e7bdd9bafc5e0c30f6d4cc3a1c31f
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The heuristic firings indicate that this is a link farm designed to redirect users to malicious infrastructure, with one URL specifically identified as a redirector. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wb?keyword=avery%20labels%20template%20for%20apple%20pages In PDF document text
    • http://begemot.space/music_80s_video_collection_volume_25guhk.pdfIn PDF document text
    • https://kigolaris.weebly.com/uploads/1/3/1/3/131380971/livigalexakamavipuz.pdfIn PDF document text
    • https://dupafubakatato.weebly.com/uploads/1/3/5/9/135961249/4908992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476147/normal_60068e86069f4.pdfIn PDF document text
    • http://trenketo.buzz/1502899912175h9.pdfIn PDF document text
    • https://cdn.sqhk.co/ralapogifur/zgjjdjg/nijazozopubivebola.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/7006161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381752/normal_5ff6c9824c3cf.pdfIn PDF document text
    • https://nenusisuma.weebly.com/uploads/1/3/1/6/131606583/wopuruwefif-wepevinomun-poxutogumegiz.pdfIn PDF document text
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/jetaxesat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5fd67a75861a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5fd92d7266bf3.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/2022715.pdfIn PDF document text
    • http://car-test.pro/critical_thinking_processgksq7.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/laban_guvokafonizego.pdfIn PDF document text
    • http://woxemezamuj.iblogger.org/aws_rds_db_instance_cloudformation.pdfIn PDF document text
    • https://cdn.sqhk.co/jitolado/6hjhyjf/used_lpg_storage_tanks_for_sale_in_usa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_600f18c2dbe14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sagunum.rf.gd/xajenanakalusafan.pdfIn PDF document text
    • http://rajiwewovipu.epizy.com/colby_brock_arrest_report.pdfIn PDF document text
    • http://fufebelanamug.rf.gd/attendance_allowance_form_completion.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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 5512 bytes
SHA-256: e03f1b58916d41eb89a3da5a8ed49eef6deb507139c39d1d5c54b2ed677d0d18
font_01_sfnt_off0000f1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EA 10612 bytes
SHA-256: acadba13f5aa75ddee960b836ae7a8170767e6d0b1f573913da8464ebf179713