Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c38dd9022bf9f5…

MALICIOUS

PDF

81.2 KB Created: 2021-10-12 10:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e9ea4fb89c0672ab3cc2704c9025cd4 SHA-1: 5555d57a8c59b62b234f322876429a8ad76fa125 SHA-256: 01c38dd9022bf9f58c3e739d98265a7ad1641b282991111a82c7297e14a4bcaa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://kstraders.com/userfiles/file/gopojit.pdf In PDF document text
    • https://magicdiscoradio.hu/userfiles/file/62228296533.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/24727378392.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/fununebovapipexaloborasiv.pdfIn PDF document text
    • https://datajournonepal.org/files/89064578902.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cc64ad023---21601781779.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/vepovoma.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/koxisesow.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/17538085300.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/vumigo.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/putezod.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/ponirukixamivega.pdfIn PDF document text
    • http://mimpiindah1.com/contents/files/76660212581.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/46130180999.pdfIn PDF document text
    • http://deforma.it/userfiles/files/fenepemuvulizetavob.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/zanivexarimizaza.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/28823921249.pdfIn PDF document text
    • https://razredna-nastava.net/files/foputitafowavojuk.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/19054576246.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/junuroligiwenamesofo.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/8095197637.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/lebosupekulizeso.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/futexi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=spb+tamil+songs+download+free+mp3PDF link annotation
    • 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_off0000d794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAB 11316 bytes
SHA-256: 6d9cbc0b4127b5b9ac9deabdcff80653a91f32bb48db1288858d04cc235ba3e2
font_02_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 17452 bytes
SHA-256: ebe056a521fe20278464620a7dedad4395b73a0b977ca039016747d7258b8d78

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