Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a19b9ac88966e2…

MALICIOUS

PDF

71.0 KB Created: 2021-01-03 11:58:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b61227edcaf822c4f9d5b9917d76c7be SHA-1: 29792a2845350d4034fb3f97fe3bdff8fdb5fe13 SHA-256: 99a19b9ac88966e21ba8d147b2fd0fbb865505aa12d8db923d91e823e03a9fb1
156 Risk Score

Malware Insights

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

The file is a PDF that contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. One of these links, https://trafftec.ru/123?utm_term=the+deed+is+done+meme, is flagged as suspicious. The ML classifier and ClamAV also identified this PDF as malicious, suggesting it is used for phishing or distributing malware. No scripts were extracted, but the presence of numerous external links points to a malicious intent, likely related to directing users to harmful content or phishing pages.

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://trafftec.ru/123?utm_term=the+deed+is+done+meme PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390641/normal_5fd7ac1dc6777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5fc14e63adf7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_5fdd924147026.pdfIn PDF document text
    • https://pudibodug.weebly.com/uploads/1/3/4/4/134464821/xigosoxupu.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/a67d69c1-3afa-4754-a6bb-0f83a3a46ebe/76374344760.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7cec72-9dc0-4f86-b7f8-20977e2c5856/wevuloluluvaxapupetexut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb2726b-e443-4d04-b730-6728d21dbfed/zosumosupezidok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f560061e-35f8-41df-9b3b-25108ec19ca1/50458335418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/389dc45c-c836-444c-bc2e-36aba2f7a4cd/75925328518.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2a0416-9d0d-49cf-9586-147ac546a8fe/turn_off_related_videos_youtube_embed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45d639d1-4393-4319-bb2c-9bd662acf56a/making_stuff_stronger_worksheet.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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 4676 bytes
SHA-256: d9c64cd2e0c735ab11d00cb0bd0a2c372f527407a6bfc0a96abd0382bd7ae567
font_01_sfnt_off0000ead1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 10852 bytes
SHA-256: 9b99d0c8f0a9db2103425f5ccc2eeb89a998df903b75bbfa156b4fec936e4f03

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