Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac0c38f53b16cd2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 00:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c9200f01057a0acf78260430d6d0c29 SHA-1: cc2598c95f43f175dd21c535d70b472484e9f2ba SHA-256: 0ac0c38f53b16cd2feb5f04b636e7e5a81e4fae5b2211f3ae3224e8a304681e7
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm. The embedded URLs point to various PDF files hosted on potentially disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/68597280356.pdf In PDF document text
    • http://bezpiecznamlodosc.org/files/file/89834544336.pdfIn PDF document text
    • https://korankertas.com/contents/files/xipeso.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73424688997.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/komarokoxobivesik.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/timokivekijaluwo.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/nejolokitefujixamuge.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/tuvone.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/1110074126.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/69181568663.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/kewidiludunarodogi.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/81790071370.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/zonin.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/30049899743.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/5847323194.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/71697465632.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/32521245364.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dfee31646---pofurobisasoveputafabud.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/sedopavuz.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/zeter.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/jefigiwifudox.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/91348971097.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/63351537864.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907142838601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pdf+t0+excelPDF 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_off0000c7a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A2 9948 bytes
SHA-256: 911a3fa0bfa81f3c492b186f6a6f740e3ecff210f95b4a2e927f1d1306d3cfd9
font_01_sfnt_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 19316 bytes
SHA-256: 5aeeac6f527de5b06b6ed0e94531cc0ad261e499d272a982e976b4be7e26e38d
font_02_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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