Malicious PDF — malware analysis report

Static analysis result for SHA-256 16204d7b53b1651a…

MALICIOUS

PDF

77.9 KB Created: 2021-05-29 09:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a9e2c18c4d4642b898f67bd6abac071d SHA-1: 5c9ef1c48c5bc3c315147608c863cdcd2ba78380 SHA-256: 16204d7b53b1651a9674b3f1e2679a693fe3f0c0fb7cadb44d33350c318c6ac7
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 by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary external URI points to a URL that appears to be part of a phishing lure related to 'police cadets uk application form'. No scripts were extracted, but the PDF structure itself is being leveraged to host malicious links.

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://jottigo.ru/123?utm_term=police+cadets+uk+application+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5fe72f0840243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_602792837476c.pdfIn PDF document text
    • https://ragurinibobuma.weebly.com/uploads/1/3/3/9/133986244/e2acd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383917/normal_5fe2740632f4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5fd036fddbb4e.pdfIn PDF document text
    • https://sawotulexude.weebly.com/uploads/1/3/5/2/135298589/4683679.pdfIn PDF document text
    • https://kulaxewanugig.weebly.com/uploads/1/3/1/3/131384484/881dd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489732/normal_602216c076483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402948/normal_5fe0bd4933fb3.pdfIn PDF document text
    • https://sovinupuni.weebly.com/uploads/1/3/4/7/134762808/7211806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481408/normal_5fe2c225a684a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488103/normal_6057c07e78a1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486983/normal_5ffba633742f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450243/normal_600cf84ba94c1.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/d92a5e10-0618-448f-bb39-34381160884e/girl_with_the_dragon_tattoo_2009_watch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67494e9-60db-491c-979c-1d3d17ec181d/pearson_pre_calculus_11_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e08f16d6-bcf9-4530-9e30-a8952211d86f/89449770384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c54f81b-fdcf-4c9a-b66e-3d82e5f79251/48399346747.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7693753-1599-4e31-a380-f725c49ca57f/arris_sb6141_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12448a03-8ab6-4f77-b6ae-f5c7c4bacd2f/nupiromigimumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa3956ec-d9f5-4ee3-8102-df69d4852b86/how_to_take_professional_photos_with_canon_rebel_t5i.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_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 5368 bytes
SHA-256: 5ce49edad0ac25fc063d7b5a80557ab246de240b55debf9fde57432e29d4d0c4
font_01_sfnt_off000103ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EA 10904 bytes
SHA-256: f1d2cc8dce491101681d3c70efe5b969f23c1a07945a8db9044b4b9fd1ab193e

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