Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a34d9b47362ea3…

MALICIOUS

PDF

70.6 KB Created: 2021-01-06 11:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 73a796bdcc6d638ccab678263d0ff1c5 SHA-1: 2eb94808327be7dd4281998f1a0ff627dae6953e SHA-256: 28a34d9b47362ea3bf21625b6b13831e7247d9e490d8517da782a7f2bd84eb9b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, forming a link farm, and directs users to a URL that appears to be a lure for "ccna cyber ops chapter 12 exam answers". This suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=ccna+cyber+ops+chapter+12+exam+answers PDF link annotation
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/sipenixurusibug_nofon_xojewisuvarif.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/ygifbNj/daluleterubagibifijuk.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/ic1igif/53005619728.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/jhieIgd/31910265977.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/efec600c.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/jepiijc/jukosenopal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459321/normal_5fc09d535e47b.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/rijujolosawu_xuxolubaruxumeg_wixidu.pdfIn PDF document text
    • https://tarebizadutobi.weebly.com/uploads/1/3/4/3/134310067/babidebinuji-romajam-natisedupavi.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/kujesulad/79926692444.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/marivu.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/apc_back_ups_650.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/37088169852.pdfIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/electrical_engineering_mcq_with_solution.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_off0000d4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C5 5632 bytes
SHA-256: aabf1426a1bd194765a4e85373a2e2fd6182a623248b712d14789db885367023
font_01_sfnt_off0000e7de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DE 11056 bytes
SHA-256: 038d1136f8d2857b603a21dbdd29a20bee43e5ff149154718647d9c75b5e634c

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