Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37ac119d13ce67a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 10:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5caf34ccb8e40714da586f980e5a3af5 SHA-1: 02a34a68dad95a302072adb318651396795eca14 SHA-256: f37ac119d13ce67a7db491e368710fd7e6ba8e101728b10320d5a9141377abc1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, and is identified as a link farm. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://synerhu.ru/uplcv?utm_term=ororo+munroe+sexy PDF link annotation
    • https://askflip.com/uploads/files/7266204865.pdfIn PDF document text
    • https://music-group-store.com/upload/files/89205719276.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161319198aac32---bugudixuxoraris.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/mezetazoxewiraf.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/fixomufakik.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/71283723232.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/fuxaxumo.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/biwuxukis.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/zagezinog.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614735651f739---niwifizofemirezuwirov.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/rumazazudovelunexojek.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/65908989015.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dogibagitumutaf.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/47812952290.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/99568575167.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/14546333159.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/72024938259.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/dubinile.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/84428727312.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/6764028314.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/13358429601.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/27426755791.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/71724986634.pdfIn PDF document text
    • http://abcs.umontreal.ca/upload/files/midarudejirusuvexojusoj.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/sakepavurejunufiwotata.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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 10212 bytes
SHA-256: 14b5bdbd7d92a844eabf2bd8afdedeb5b5510ba51c5d3adef1fc34ffbcdb36cb
font_02_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 15268 bytes
SHA-256: 935fc2ca9cd56dd74d4a2551d41317018d5264a70068ac39758b0d1922c7feef