Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15a1f5c9a7b9fe9…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 09:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a020560c7e1fbf2971ebaed480f8672d SHA-1: 92260d5cda31df9b81c1f4b8f70f436638d80569 SHA-256: e15a1f5c9a7b9fe9982f49ea5f56d302482059d88765c8000145c9fd48cd20f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable hosting, and is flagged as a link farm. One URL, 'https://allytemp.ru/uplcv?utm_term=how+to+get+superuser+privilege+on+android', suggests a lure related to gaining privileges, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=how+to+get+superuser+privilege+on+android PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/8b9358a1d293f5d46a8a062edd70838f/90637400761.pdfIn PDF document text
    • http://kco.su/userfiles/file/luwekuzipebibozunalovupiw.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/77460015756.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911143442506031.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/89123252608.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/89375387389.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/dekeguzajerokem.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/nepajofumez.pdfIn PDF document text
    • http://519pf.com/userfiles/files/mubatizapowo.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/69716278272.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/38343685011.pdfIn PDF document text
    • http://symbolfoods.com/files/file///liridudisixaketeradimo.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/kamukezazezurexinijizaso.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/31756156648.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/wokagarebu.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/senomewokanorixonap.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/86382180152.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/1844524658.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/zamuwudanoluxorubiwor.pdfIn PDF document text
    • http://keramann.ru/uploads/files/6047144527.pdfIn PDF document text
    • http://27derajat.com/assets/ckfinder/core/connector/php/uploads/files/66106010505.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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10812 bytes
SHA-256: 8c0fc0c7506a75458cd4c7038739541169a61af3f18a721994c7785a69fc96d1
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 17580 bytes
SHA-256: 54f8b901f67eeb7eb2360df40b082f7b469c50cffa621ccc1a4d474c1c66a06c
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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