Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5a81904cf125fd…

MALICIOUS

PDF

82.6 KB Created: 2021-03-23 13:25:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 69a725c34fecfb906f20722bafc50239 SHA-1: edc7c27cfc4904c8a5d35738868f14e85d0b0cab SHA-256: 3a5a81904cf125fd81444312784d037a2f7332661d30a5cd3b4b57e0170dbf9a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant heuristic firing indicating a "PDF_SEO_LINK_FARM" which suggests a large number of links pointing to other PDF files. The presence of a "ML_NYX_PDF_MALICIOUS" flag and ClamAV detection as "Pdf.Phishing.Trojan" further supports malicious intent. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the primary external URI points to a URL that includes "keyword=tomboy+survival+guide+discussion+questions", indicating a lure to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=tomboy+survival+guide+discussion+questions PDF link annotation
    • http://supportcopyright.net/miguwelazufemujepenukav7kixt.pdfIn PDF document text
    • http://indital.space/carry_on_baggage_weight_restrictionszy3nn.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/what_is_the_best_dewalt_18v_drill.pdfIn PDF document text
    • http://labiosdewonda.com/249221600941xiqo.pdfIn PDF document text
    • http://businesshelpservice.com/subordinate_conjunctions_list_ks2odou4.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/davizari.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/what_is_the_purpose_of_guidance_office.pdfIn PDF document text
    • http://vexezujuzas.scienceontheweb.net/basel_iii_agreement.pdfIn PDF document text
    • http://uaregroup.com/bovidepugutscdn3.pdfIn PDF document text
    • http://jerabigemoz.sportsontheweb.net/nugawexibin.pdfIn PDF document text
    • http://agentsecure.space/tiwiwufinugomu689p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_dde8e49b5c9d4d7dbb299faa52395040.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/how_to_stop_visual_hallucinations_naturally.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/capacitor_220_microfarad_datasheet.pdfIn PDF document text
    • http://warufadul.rf.gd/demuveworadoj.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/63871529034.pdfIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_ab89019f75f54cc59b05edeea92d479d.pdf?index=trueIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_7a43a8c6b36546e89880b79f50ae3a09.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/71811764319.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/contraceptive_pill_guidelines_uk.pdfIn PDF document text
    • http://jipezanegasan.rf.gd/81115488152.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_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 5636 bytes
SHA-256: 8075972c0b09dbfaf7305d346788e94186f8df95f6c4fc057257813fc548adc5
font_01_sfnt_off0001161c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161C 10988 bytes
SHA-256: 1a2c820f5a4fad165e2701dc0a5152ec1437d41a80d8b96d651a857d585970f6

Open this report in the interactive analyzer, or submit your own file for analysis.