Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4723bc2f9f8e00…

MALICIOUS

PDF

107.8 KB Created: 2021-06-03 04:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f7019d476395b6cb6aa22054c5222e80 SHA-1: 69adb63bd843ee49d4f4fc5581bc2d2ac5aa7b44 SHA-256: 7b4723bc2f9f8e002f6fe735fb3102f88d5ec2c5878904802218d309d794c717
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL suggesting a lure related to creating birth certificates online. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely malicious or part of a phishing scheme. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the presence of many external links points to a phishing or credential harvesting attempt.

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://crophysi.ru/123?utm_term=create+birth+certificate+online+template PDF link annotation
    • https://xesisezedowajax.weebly.com/uploads/1/3/4/7/134729639/nakusataxumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418370/normal_60302e2b3cc87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418574/normal_5ffbde023ac7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_60585ac5ad691.pdfIn PDF document text
    • https://fofapabijutoza.weebly.com/uploads/1/3/4/7/134713913/51d09dd8de.pdfIn PDF document text
    • https://gafekiwukuwemul.weebly.com/uploads/1/3/4/3/134313713/0767a025.pdfIn PDF document text
    • https://jorikune.weebly.com/uploads/1/3/4/3/134371696/veserove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494440/normal_5ff6826f10bba.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/77cbcb01-1f48-4193-947e-253e4a583476/25919993437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0309a9ae-f50c-4921-917e-89f1c148d992/14059862881.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3099e9d-a56b-42e2-8ea8-84be8a05d411/lejijub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c52e630-c6e2-4dfd-be2a-076354484c06/act_workkeys_scores_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33c9e72-b4e5-4ee1-8408-10d41127e841/bolt_action_rules_quick_reference_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b57f1a5-395c-4996-a97c-5d837058cd70/81747261383.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f825241c-7053-4d98-9fbf-db5aa070df69/44248613706.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e596647b-45a2-4664-b504-37663137e9bd/xoxitaj.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_off00016ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AB6 5124 bytes
SHA-256: 7323fcfa35e7d08577041c9adfb1f15bb3348d9b2820f2817fc6a6ef2f5b29aa
font_01_sfnt_off00017bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF7 11064 bytes
SHA-256: 9c51aaeaca9781caf9a954d7af205ad787b8106c19699a5d148790dbfaf56083

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