Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd1377a7d79a8fe…

MALICIOUS

PDF

80.1 KB Created: 2020-11-20 10:03:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5dcc38090e62453a4d7e4a62d5cc5738 SHA-1: 11fa7c392c0fc2d41a2a2abd004327a8050eaffc SHA-256: cbd1377a7d79a8fe6fea0ddaa1ec51d6ac394fae961d4e53c181e3e27216df3e
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 0.9997

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://trafficel.ru/aws?utm_term=dell+latitude+5590+spec+sheet+pdf PDF link annotation
    • https://dubedudufataf.weebly.com/uploads/1/3/4/4/134493514/5c03cfadf218.pdfIn PDF document text
    • https://sefizofemaj.weebly.com/uploads/1/3/4/2/134266575/wupes_pepadafoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/14430837728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a1aed76-590d-4106-a9e7-ba384f372183/nominal_data_stats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82577034-8bb7-4960-913c-9835d4098d45/9039952615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce170439-55b3-4c67-944c-089dc7e598a5/mibakekituzananub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b25ba5-a827-4bc7-8f9a-cf0959fc0df6/eagle_scout_goals_and_ambitions_letter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f1ba4f6-8bcb-46e0-87ff-dab950956fbb/30952481838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2319e97c-94ab-466e-8d3a-333aaafad968/52050225722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c78af83-d970-48ac-90bc-d526592ca6ab/cualitativas_y_cuantitativas.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/basara_ppsspp_emuparadise_iso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51dd8525-00fa-402c-be57-f63918b4f14a/70963250357.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/65735322800.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_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 5568 bytes
SHA-256: 7bd6f3f8ff6e572af5b45efa957411dc9a6d89569b3900cb9ce3a65809584906
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 11088 bytes
SHA-256: 175dd9965b33ac6ae7d92be76a441e0a07837337cd2a8d8798e9357a3a119f99

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