Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d3bdb99c297c3e…

MALICIOUS

PDF

65.4 KB Created: 2020-11-24 02:39:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: e5709d3cecabc77aa29ab463fe9b723b SHA-1: 9707aa51bdc43576922c666f686f843dfa7aa99e SHA-256: 79d3bdb99c297c3e9249519dab0e5fa50e1325153d0d070716d92dc6c2f931e5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with the primary URL being a phishing lure related to a school teacher arrest. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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 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://trafffi.ru/123?utm_term=east+whittier+middle+school+teacher+arrested PDF link annotation
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/726970d67.pdfIn PDF document text
    • https://somubafe.weebly.com/uploads/1/3/4/4/134444697/7302297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410214/normal_5f93aece5c88d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f93e868ded49.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bc2c47c-cbf4-4798-8993-adc0411ffe6e/27984293681.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/vertebrate_zoology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/49358486610.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/tifobuvoxasukafesetata.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/computer_class_worksheets_for_kindergarten.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/57223152605.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/knee_strengthening_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/momova.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/primark_size_guide_baby.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/borner_mandoline_manual.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC472 5228 bytes
SHA-256: 52d466eadc13ab3ea0e881653146b487a6cae841b965ba157bf5597158b0c54d
font_01_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 10144 bytes
SHA-256: d425dc52a9f50a588794fb5bc605fe8296b93d267e76ea664426db4d4bb57aa4

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