Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb4cdb67fe4ede3…

MALICIOUS

PDF

65.5 KB Created: 2020-11-24 02:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cc779e253133e7402913397dbfeb9503 SHA-1: 82e4c007d3b715e6bc5f531287945436cf6b94f3 SHA-256: ecb4cdb67fe4ede3fc0b0ea527fc585213389e37bf4c5335f6a67624ef3c559a
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://traffking.ru/strik?utm_term=engineering+mechanics+14th+edition+pdf PDF link annotation
    • https://vebusigatibata.weebly.com/uploads/1/3/4/3/134321359/5ea9310f5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459785/normal_5fbc3376a6d50.pdfIn PDF document text
    • https://fisotewefupug.weebly.com/uploads/1/3/1/0/131071176/nopovujex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_5f8e4c74e6b2d.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/a8353d60-aeb8-414d-9984-cfd1334a1da6/lexijadisurefazinisipukos.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/yosemite_guided_tour_from_san_francisco.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/vurexiwekeja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bc0b12-aac5-4007-8228-45b123bf365d/58432927315.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/rawevisowubitow.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/liwosinefebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf28e0d-82a0-420b-82dd-01775bf8c231/sijupeba.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/f1_visa_questions_best_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/244588c0-22c1-41b4-a9c1-d6581b7477e8/58547151790.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/13874288809.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/they_see_me_rollin_they_hatin_meaning.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_off0000c050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC050 5636 bytes
SHA-256: 08918098cc4122d9841e377940826b3a280e52312686397e2cc02f05da8d6b2c
font_01_sfnt_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 11396 bytes
SHA-256: 4dd7432cd967a0abc11e06c1b30b6cf0861481c215ec324ddfeeb01584c0d853

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