Malicious PDF — malware analysis report

Static analysis result for SHA-256 728089e5706e0f68…

MALICIOUS

PDF

66.9 KB Created: 2021-04-20 04:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9f088c8d3ddbf25b652805c19e7ab6a7 SHA-1: c627cc836b263a3c13a3c0db2be4e8e76941e417 SHA-256: 728089e5706e0f6804558e6daf9251b76a028d029988920720ea07f35d09457d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://xajibur.ru/strik?utm_term=tonal+harmony+workbook+8th+edition+pdf PDF link annotation
    • https://gaduforijap.weebly.com/uploads/1/3/1/3/131381464/kilelenemonolele.pdfIn PDF document text
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/tumubozudupulol_mokap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366964/normal_5fdd3df7d27fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374688/normal_603ff4d17d183.pdfIn PDF document text
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/mexaxinetoje.pdfIn PDF document text
    • http://trelon.fun/gomipaxizuxelavmhc.pdfIn PDF document text
    • http://psylath.com/for_elise_piano5smaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5fd7651ec0870.pdfIn PDF document text
    • http://tryraisins.pro/golf_buddy_voice_23p1cc.pdfIn PDF document text
    • https://sugowula.weebly.com/uploads/1/3/4/6/134646485/nazexejibibegi.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/nisuro-bixuzesa.pdfIn PDF document text
    • https://kogexabisuzim.weebly.com/uploads/1/3/4/3/134322867/legomon.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/iguhgie/59273957942.pdfIn PDF document text
    • http://kpovli.ru/goziwosodidowisifujuww500.pdfIn PDF document text
    • https://cdn.sqhk.co/wafexumu/fhgibih/unchained_melody_sheet_music_musescore.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/onxPGie/rasegomifepejemisufodem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48D 5644 bytes
SHA-256: e29c991d1114028070066fe12c92d7e9a14d40f724725d60e7cf41551daa8692
font_01_sfnt_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 11024 bytes
SHA-256: 55b40f7aaf8a634aabdb62d7cc04371951999fe18e19ff154081adef76fe602b

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