Malicious PDF — malware analysis report

Static analysis result for SHA-256 5baf7ad89f76b45a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-12 14:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0f911b171f4338528595911b7c2b943e SHA-1: 482f6eb71d12ddd3583a05599ab1cc21dbc9ae2f SHA-256: 5baf7ad89f76b45a477a8aa2d2ded714360c3184ea4e08e4871fba03c292157b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to external domains, with one specifically identified as part of a link farm on disposable hosting. The presence of these URLs suggests the PDF's primary function is to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://smidgel.ru/uplcv?utm_term=why+contacts+automatically+deleted+from+android PDF link annotation
    • http://ei-windykacja.pl/upload/file/93113207085.pdfIn PDF document text
    • https://yasacompany.com/upload/files/bariwimopibegiboka.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/10410616192.pdfIn PDF document text
    • http://alltechsro.cz/files/difenuxofunamo.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/lifodedol.pdfIn PDF document text
    • http://cloverdiamond.com/file/zuzopilamu.pdfIn PDF document text
    • http://lawngo.net/fckfiles/61611178475.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/97945564533.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/genasarudarope.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/9794181590.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/36095022700.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/54326433518.pdfIn PDF document text
    • https://salwangurugram.com/files/lajimunakasabigu.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/45173681545.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/59738921505.pdfIn PDF document text
    • https://n-tlg.com/files/file/46031919820.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210902101840_f3kgac.pdfIn PDF document text
    • http://boldogelet.hu/media/81690573969.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/69466746363.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/xulazotadux.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC599 15920 bytes
SHA-256: 00e73a3e9fe77635b7d8da5bacbcbf24d4949e452e18292a0c545ec2fd2356b6
font_02_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 10948 bytes
SHA-256: e0984d95896f43c13c69fd44ae49540227f814efb97836b5b001e8226b1609ca

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