Malicious PDF — malware analysis report

Static analysis result for SHA-256 8708265894164c6e…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 18:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0eba8ee45cb74a8f86e76ec0d6e908e1 SHA-1: bb0cf45fe4f0982be62a59d28b5f441bd3e84e54 SHA-256: 8708265894164c6e1d3017af0db7497becddf8280dea21cca972df56dd2d826c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://allytemp.ru/uplcv?utm_term=apk+my+talking+hank PDF link annotation
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/19439077574.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/72588710327.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/fejumanedaxebezomejegir.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/61541827326.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/jusifikotesabigubetepixam.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/1314606431.pdfIn PDF document text
    • https://everestart.com/images/stories/file/93901648736.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/wisunivanusemodedukep.pdfIn PDF document text
    • http://gleb777.com/fck_upload/file/95102481313.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/66424230310.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/9952579233.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/suxipikakujigepafukut.pdfIn PDF document text
    • https://hoalavender.net/upload/files/60673072859.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/be0703ad4af9f20204a9b5059f7686a4/34166218321.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/pubigifezane.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5de3ceac---6310664675.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/82099540158.pdfIn PDF document text
    • http://www.grifin.sk/files/11117531680.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/vewovalexivediru.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/zopeledimobuvige.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/98997727611.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/lafufijivuwuziv.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raregogisubat.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_off0000c685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 16324 bytes
SHA-256: 931e97955da8ab1071333217747f2890b27428b767586dbaa818f34c1178ce39
font_01_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10873 10368 bytes
SHA-256: b9ff786eb546a87e9578a3630563058de451fc939dcfc82ceffba31f75ccb652