Malicious PDF — malware analysis report

Static analysis result for SHA-256 f38178de8da8e9d1…

MALICIOUS

PDF

68.8 KB Created: 2020-11-18 07:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0f928629fec4a633f1824f67a6280524 SHA-1: 1a5c0be9f512771d9f0163b6edc55f1b2564a0ef SHA-256: f38178de8da8e9d1296168eb6038c425a30479513af75b253c88bb71058730e6
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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/aws?utm_term=anjaan+audio+songs++2014 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f94c9b1334bb.pdfIn PDF document text
    • https://juvirafiwak.weebly.com/uploads/1/3/4/3/134307718/felumokare-rabidukazel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367923/normal_5faf53fc56e3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5f8788c2595c3.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/6ef46.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/09adc9ce-12e9-439a-8af2-32ab48770eb7/personal_firearms_record_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nujosuwemedadi/68334318120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77b7d07-82b4-4591-a7e9-e3142629f652/apple_store_for_gov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2897dcce-ef57-4a5f-bd34-b75aa0c134ee/80844606391.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/72964658794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a7af8b6-e947-4798-9c18-83a6e5e92528/47282197228.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/original_oratory_speech_and_debate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e45ab2c-9fd5-48fb-879e-216a802c6666/kenofototev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df2829b-fa60-456b-97b9-323ed4e5f7cc/38397749754.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8D5 5344 bytes
SHA-256: 5667059b9f9d6ef36287315fb6c356da95290b42bc7f15013c96a0b46c3b8289
font_01_sfnt_off0000cb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB25 11304 bytes
SHA-256: 39686d52763dfb3bde8dff6448314d9da3ab32fc3644ce099e65269dd37e3572
font_02_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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