Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7212f8599988801…

MALICIOUS

PDF

67.5 KB Created: 2021-04-05 04:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4793c9a10deba2cd75134bfd348286e4 SHA-1: 203afbf7326d623664fe1f68d59a23767f4c53bd SHA-256: b7212f8599988801ef52ee250f1d9a71ead7e8485070d9ec2f8bb47ef1eacf2e
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 or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=calvin+klein+performance+plus+size+coat PDF link annotation
    • https://cdn.sqhk.co/guwuweri/cpjcPie/space_needed_for_air_hockey_table.pdfIn PDF document text
    • https://xemilesexevig.weebly.com/uploads/1/3/4/2/134266110/4963446.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/83185376707.pdfIn PDF document text
    • http://pevazaw.mypressonline.com/kimobitojewozesiv.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxabofapuw/jgeAgeS/best_hero_wars_mobile_team.pdfIn PDF document text
    • https://cdn.sqhk.co/pugirunosamo/jhhfjhi/real_drift_bike_racing_apk_download.pdfIn PDF document text
    • https://guwuviwanawa.weebly.com/uploads/1/3/2/6/132695801/5019693.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/girshbh/sugiradenexegoku.pdfIn PDF document text
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/5921f45ed5d06.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/hhhijaC/zara_kids_coats.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/harx0gj/10237598868.pdfIn PDF document text
    • http://tisejamebip.sportsontheweb.net/davudajedoteret.pdfIn PDF document text
    • http://dodemul.mygamesonline.org/77605579549.pdfIn PDF document text
    • https://cdn.sqhk.co/rasadenibe/ehh1ghS/mumijalolibujugafi.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/biwogalekesip.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/479b0f8a-ee19-4f8b-9fdc-c4748296b37f/56156064738.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/jazemozus.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/britannica_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61085f01-ff67-4948-8f01-0857358b5157/fadebaxasofigejojirikilum.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_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 5240 bytes
SHA-256: 1908f64734c455ddd145b916e2f7606ca0150f9e799d5308feb571a664ed1949
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10312 bytes
SHA-256: cb5b2723699e36e0b352852ecc1fddee47a420d0119aa30729a7accbd05aa290

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