Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a1d8e199c5573b…

MALICIOUS

PDF

79.8 KB Created: 2021-09-24 04:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8508ac9865262e25ea7f9c09bb48a54e SHA-1: 6f4984def6d4995f8ac50cfcad47102c83494717 SHA-256: 95a1d8e199c5573be5758394437b1f7910382029b8e7242df43a314e12d45133
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The 'utm_term' parameter in one of the URLs, 'get+free+insta+likes', indicates a potential lure for social media engagement scams. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pushtypathshala.com/demo/aims/files/images/files/1433574125.pdf In PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/25700606922.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/19052115974.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/wejalovasuga.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/rutewevitodote.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/xopusipewejerut.pdfIn PDF document text
    • https://samudra99.com/contents/files/2240826225.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/fedide.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/nativojijibitalunomepap.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/91557981415.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/rololizevafe.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/20187037041.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/67156265685.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/62339524488.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/95239329993.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tunutesesevibezug.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/74483496901.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/pefijirakenasamosob.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/32782645164.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/pemodulutopilagib.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/jomaxurozisojilawotibuz.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/76805879843.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/13064826079.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/vegifitatixifaluwigi.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/3123420744.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/63408706593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=get+free+insta+likesPDF 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_off0000d4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 17800 bytes
SHA-256: 95f38ccdcd998ac4b991f4a957a667a06e48ee9b9d9c6a677512c2d3fb71822e
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10216 bytes
SHA-256: ccf93d27b0388fd0654ddbf9b6597f465e7c2c764de9257832641534772a10fb