Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9671a3a15026e01…

MALICIOUS

PDF

70.3 KB Created: 2020-11-16 20:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 40fd98ffdce24afa42ebb68971e78b35 SHA-1: dadb9759fc83898ba6cb410c42b851b0cf4ec6e1 SHA-256: c9671a3a15026e01a83e66da331b375bcc50cd2808f9d2b64a78d551d23d3d70
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-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://trafffi.ru/strik?utm_term=ingenieria+de+mantenimiento+renovetec+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f9b3a47055a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5faf7366c8bc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f8fe7331bc34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405639/normal_5f96899274520.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/jatesepanodesur_rubewufu_lajepe_nudupobeka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390057/normal_5f97ca51463fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410013/normal_5fa0f4c732e1a.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/43135a0e-2867-4cd0-9cca-5e629388a545/tesla_code_secrets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574a8239-a5b4-497d-b748-75be1313ad79/guess_seductive_homme_noir.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/one_letter_words_in_japanese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f9aad8-47d7-48d5-81bb-6d38a967e810/boneless_fried_pork_chop_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d64e3759-33c5-4e4a-b169-993c2297d9d3/misititabiluzitejeto.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/woodland_shrubland_biome_common_plants.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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 5260 bytes
SHA-256: c6687b3e3844f3e96ce447dc9dc3178f74d841fe03ff961879bb631cc2442a83
font_01_sfnt_off0000e25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25C 12248 bytes
SHA-256: edd14bf7ac4cb650fd3f48c5ca0a56c8d69bfe7d61ca16ba6f7c7116a877b327

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