Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc86d6ad2395d79a…

MALICIOUS

PDF

72.8 KB Created: 2021-01-10 01:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c118cc41c12f9d8f8a3b0791d72186ef SHA-1: c61035b17dcac724f9ba90420d2d2d461e7f3882 SHA-256: fc86d6ad2395d79a87a9ae5791b7e829f4f1d3a608b53aebbc694a162a44ca1a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, and one of these links points to a suspicious URL that is likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing a second-stage payload.

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://traffnew.ru/123?utm_term=7.2.5+homework+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383916/normal_5fd7b338593c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5fe2dc3c695fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369152/normal_5fa273fd3c3c7.pdfIn PDF document text
    • https://sinegozedajosor.weebly.com/uploads/1/3/1/8/131871849/wexula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480736/normal_5fc8b40ad3ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401694/normal_5f913f5113d5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457849/normal_5ff7628a461b8.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/misubafuxupomuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_5fc1575654ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f959a625ae32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382209/normal_5fdfa45c678e4.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/9f911d038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5ffa3c79b3421.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/mukutud/handwriting_letter_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/venice_a_new_history.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_off0000de63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE63 5324 bytes
SHA-256: e9dc7c6bc024878403bc16af3c97fe27863c8c1f8d9b1d71496ad1eb8e819e81
font_01_sfnt_off0000f06f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 10732 bytes
SHA-256: 6027cdb8bde610511b654bd9c5654257f2392e9b467e4e13ef7cce54f648c96c

Open this report in the interactive analyzer, or submit your own file for analysis.