Malicious PDF — malware analysis report

Static analysis result for SHA-256 9655f0f60e611adf…

MALICIOUS

PDF

74.0 KB Created: 2021-03-14 04:46:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e8cf7dd6f279ec202a795f148d817f6b SHA-1: 973b529fe203bb0c808836df70fa35af6123dde1 SHA-256: 9655f0f60e611adf579996832a3dd791b74a69ccb70a307310ea126e5375eb6f
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9993

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 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.
  • 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/strik?utm_term=blues+scale+guitar+key+of+e PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5fe907e2c5a97.pdfIn PDF document text
    • http://medicinfo.online/how_to_write_field_visit_report6kw8l.pdfIn PDF document text
    • http://fsbsiod.com/ramapatcgxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_60287679d6e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372967/normal_6015d5a1a3384.pdfIn PDF document text
    • http://meetcabinets.xyz/57254638330gb38z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5fe41dace5761.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff8edc99e158.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/c2874495e434e8e.pdfIn PDF document text
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/jobumutifijemijeba.pdfIn PDF document text
    • http://kasovipitafo.22web.org/18489303511.pdfIn PDF document text
    • https://muvekova.weebly.com/uploads/1/3/5/3/135394778/9863774.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/xonobijikivo/how_to_use_formative_assessment_in_the_classroom.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/34497066979.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/king_arthur_brownie_bowl_pan_recipes.pdfIn PDF document text
    • http://sivujezoz.rf.gd/you_cant_take_it_with_you_movie_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/6917053975.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/gospel_music_album_free.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/consumer_grievance_letter_format.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/cisco_meraki_mr33_datasheet.pdfIn PDF document text
    • http://wapibuzam.rf.gd/90257539756.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/volipixarapebota.pdfIn PDF document text
    • http://xafezup.rf.gd/hp_officejet_pro_8600_paper_jam_problem.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 5264 bytes
SHA-256: 04eb94d10c11fb3acb14152695adabdfd591908539776d79f7cacc4afb3ac483
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 10972 bytes
SHA-256: e6db020b5d4b36c51431d7110e45abe3000326e1762934f8b66067043e14ab10

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