Malicious PDF — malware analysis report

Static analysis result for SHA-256 716161ac71eac576…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 03:30:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 341fafb00b117922e6cd54529876851e SHA-1: 7d2c4d0168f60480436486407f8b07c758a3dc21 SHA-256: 716161ac71eac576911e65509ca3c42da40d27b90baa924d948b396ab4783b96
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic to drive traffic to potentially malicious sites. The embedded content appears to be junk data, further supporting the idea that the document's primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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://xajibur.ru/award?keyword=ansys+fluent+documentation+pdf PDF link annotation
    • https://vomedizi.weebly.com/uploads/1/3/5/3/135312409/jogemumizixu.pdfIn PDF document text
    • http://sbrf.link/kolabova2p2bd.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/9417144.pdfIn PDF document text
    • https://famuzupowaja.weebly.com/uploads/1/3/1/4/131406758/risufodogaz-madumovaluk-wusutujojupase-gumad.pdfIn PDF document text
    • http://ganitigusawev.mygamesonline.org/rachmaninoff_concerto_no_2.pdfIn PDF document text
    • https://lofativunami.weebly.com/uploads/1/3/4/5/134581692/5322952.pdfIn PDF document text
    • http://naturaitalia.space/perfect_square_examples_with_answersoy6sp.pdfIn PDF document text
    • https://bumopisizepe.weebly.com/uploads/1/3/4/6/134606815/folewenolazet.pdfIn PDF document text
    • https://xuxoxipabixu.weebly.com/uploads/1/3/4/5/134588436/gugosexakasuwiwevaba.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/zedaka.pdfIn PDF document text
    • http://dobewobezusisof.iblogger.org/zepow.pdfIn PDF document text
    • http://instofficial.online/1r9er.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/22403502427.pdfIn PDF document text
    • https://zinimejab.weebly.com/uploads/1/3/4/6/134653802/7616566.pdfIn PDF document text
    • https://nonibebufixaz.weebly.com/uploads/1/3/2/6/132682934/745ec390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6a48395-9ebc-465e-8505-c4b20d7b8e72.filesusr.com/ugd/81e12b_fcc54a7edd774c90bf2ace3d460bdcd0.pdf?index=trueIn PDF document text
    • http://tiliwadovi.epizy.com/murottal_merdu_al_mulk.pdfIn PDF document text
    • http://fufabufitilaf.epizy.com/16268485595.pdfIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_ec5a1faa2eab489fbcaa2373603a255e.pdf?index=trueIn PDF document text
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_8ec9331849c641f887819eddcaa0c7cb.pdf?index=trueIn PDF document text
    • http://fogevodazeta.epizy.com/fenadazodelosujodal.pdfIn PDF document text
    • http://raxajabidadida.onlinewebshop.net/ncaa_banned_drugs.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/17296540918.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_6a6715b4174048b4ae510b8584e1eda6.pdf?index=trueIn 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_off0000ef8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8E 5296 bytes
SHA-256: 024a08b5e418e7ac0baa2522a81cec2ea6b56f4faf1d4cabb0b7e7325a2ae5bc
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 11900 bytes
SHA-256: c421389d2fa9a49ab98e85e477d7b39e7dda906737d3f3b45359f2b57d51c269