Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21baecc6d3b05a5…

MALICIOUS

PDF

75.9 KB Created: 2021-06-02 13:47:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 586c5dc6e56b7f1a2d4c80795b8fd091 SHA-1: 80e5d80a691ebf79c30c859b3ed7834f63a84fe3 SHA-256: d21baecc6d3b05a5094e221aa1ceee7cb42f45b02cd2941dc324671d2d58e29f
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or scam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crysiq.ru/pbw?utm_term=mp3+music+download+unblocked+at+school PDF link annotation
    • https://mekesenewinev.weebly.com/uploads/1/3/4/2/134234563/ranifetabibinu-devused.pdfIn PDF document text
    • https://bofopigefofimun.weebly.com/uploads/1/3/4/0/134016695/7344680.pdfIn PDF document text
    • https://litusavetedi.weebly.com/uploads/1/3/4/4/134445261/5908620.pdfIn PDF document text
    • https://ruxosirixu.weebly.com/uploads/1/3/4/3/134334364/3497570.pdfIn PDF document text
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/pevutuboxope-kasufaraw-jipogovosila-vinotorogibara.pdfIn PDF document text
    • https://notesorujul.weebly.com/uploads/1/3/1/4/131407176/7832728.pdfIn PDF document text
    • https://vomanoxugorufo.weebly.com/uploads/1/3/5/3/135331351/c0edfcd38327d9.pdfIn PDF document text
    • https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/4781415.pdfIn PDF document text
    • https://memapuzubabevu.weebly.com/uploads/1/3/0/8/130813849/9bf4e4cc.pdfIn PDF document text
    • https://rofukidixupa.weebly.com/uploads/1/3/1/4/131414661/a0bf3d63fc.pdfIn PDF document text
    • https://vipugexisixow.weebly.com/uploads/1/3/0/7/130775501/mozadu.pdfIn PDF document text
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/jinevob-zotokulosire-ruputijaguwefut-xutolasazazeku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144470889/honda_cb_750_f_workshop_manual.pdfIn PDF document text
    • http://vosebim.pbworks.com/f/20497834934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed7ec9d3-6ae0-4e9a-b22f-3502b883f2dc/jetemadadazolavimopupib.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/dopotikixexot.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144479304/76017277963.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144470772/45957409675.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/w/file/fetch/144481299/muvegomav.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144447057/google_chrome_portable_mac_os_x_10.11.6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8edc098b-2fef-4d6b-b202-28ad49230be8/79525027213.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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 5684 bytes
SHA-256: 481f1353590a97a52f86a53012e8cc57211b7816ead9ff38503d69e8a0458bfc
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 11516 bytes
SHA-256: 6257701354105da23c7b3bc8d563ef40fcb9abde7b0ccb076554a32643c2f6d2