Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd21a9151e3bbff3…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 16:11:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ce503e23fddafd5fb6b3fc9b63604d5b SHA-1: 9d79b84208f13644eeed037a5a8e32c02ae3f127 SHA-256: fd21a9151e3bbff3041ec656a39b804bbbfaa7bdb60a3d0a8d256cd3bc562ee8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wix?keyword=free+ftp+sites+for+books+download PDF link annotation
    • http://bilet-pdd.site/752188693111moem.pdfIn PDF document text
    • http://wasegulom.mygamesonline.org/bovedikajufebotaxujirova.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/zukuxunobem.pdfIn PDF document text
    • http://silewugebed.scienceontheweb.net/fukebikopobavalamove.pdfIn PDF document text
    • https://koxabiwepa.weebly.com/uploads/1/3/4/3/134309970/c72100a.pdfIn PDF document text
    • https://gekubele.weebly.com/uploads/1/3/2/6/132683169/286046.pdfIn PDF document text
    • http://gufutaca6.xyz/22530190061076t7.pdfIn PDF document text
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/dalubik.pdfIn PDF document text
    • https://zuzuxaze.weebly.com/uploads/1/3/4/0/134040629/tavudunodap.pdfIn PDF document text
    • http://uscarinsurance.info/885388153245faaf.pdfIn PDF document text
    • https://nevomunetis.weebly.com/uploads/1/3/0/7/130740414/nurufe.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/satudifin/37062914603.pdfIn PDF document text
    • http://jajogagek.atwebpages.com/how_to_calculate_number_of_working_days_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/intercessory_prayer_warriors_training.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/free_business_letterhead_stationery_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/salojarofukuvovavaxes.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/phenyl_chloroformate_reactions_with_amines.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/alffy_rev_tanah_airku.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_off00010242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10242 5288 bytes
SHA-256: c674ded6ca718fcc142a5c4689d856f9630f407de68eeeeafe2c986ad386629f
font_01_sfnt_off0001145d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1145D 10716 bytes
SHA-256: 05d795da4e122913eb9749669a6fd3de5eecc6e29a3630929b1976bb1cbef857