Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0397105e797b06…

MALICIOUS

PDF

78.8 KB Created: 2021-09-17 20:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4facfea08a640ec03e76202d7bcb2b91 SHA-1: 5a511e5b805d2282c70392a40ac3655a5847cedc SHA-256: 8e0397105e797b06ff8b1c744d850a3361f37cbe43101ee99c93b067da45e15e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs pointing to a link farm, as identified by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic, suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and does not provide clear textual content, reinforcing the reliance on heuristics and embedded URLs for analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://bona-agra.pl/Upload/file/kodupad.pdf In PDF document text
    • http://beiks.info/public/file/kumexemipudaki.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/64743055519.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/33271053724.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/tuvusijeviguviru.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/kobusofefimev.pdfIn PDF document text
    • http://laduses.nl/image/file/farojemibogetutepolifam.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d2a230df87d8ae8af0e82f426ef0273f/96558996653.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/87783078612.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/sakivabalunabavubefa.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210913231144.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/112115247491.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/12063958573.pdfIn PDF document text
    • http://sichera.eu/userfiles/files/48374455742.pdfIn PDF document text
    • https://porfic.com/fotos/file/44183173652.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/29267394458.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/36468362915.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/gatevakusanorovu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10ebb59f4---19532210425.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/takotuvularisunoluwigugo.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/falifemonidigez.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/52478586374.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202108312216177014.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=material+design+navigation+drawerPDF 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_off0000d184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD184 10568 bytes
SHA-256: aae144c3b1c07eaedbda92f6153d988a7e65e016f5ab0039ff186860752a9ca8
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AD 16868 bytes
SHA-256: 7bdd2999638f05e192c071dae1688f7653af0c200c62c2a5df0d4ce56b74f122

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