Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee54c2aef256b47…

MALICIOUS

PDF

84.2 KB Created: 2021-09-15 23:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6dc565130e85135c4850508756689cbe SHA-1: d4a22578ed6e78fcbf0db7ac2f6017e99a3e628f SHA-256: cee54c2aef256b47a05fd42ee40873c3d5c736535bfdab1d649ce99751419d23
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. It contains numerous external URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the document is designed to funnel users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=real+steel+champions+mod+apk+revdl PDF link annotation
    • https://aiwatopup.com/ckfinder/userfiles/files/penumiteleza.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/dazaguzuz.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/tajewowovirupudonoli.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/vonomirob.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/67326870176.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/67454688425.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/jugosazob.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/49067201416.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/jikonopugiguzujadapatoku.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/kasorudokuk.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/wuzafalonugobisaboluxep.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_04_03_01_35_6840.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109011345235261.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bevegipukezureturasokuk.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/12691967309.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420cdf68282---vulavudozubifodibepifetid.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/xuzexi.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/gewor.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/97396236684.pdfIn PDF document text
    • http://geraldinekilkelly.ie/fedowi.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/falekotovezafotutupono.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/tadepo.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40168194363.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/87429989679.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac008953d---xodexis.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_off0000e5f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 16724 bytes
SHA-256: e1556dca6f6e71236a6e1a0bf3b026f9a73db87e46fed178c68f95c7a0254066
font_01_sfnt_off00011143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 10980 bytes
SHA-256: ffbee0db95d0ba41f800f39547ab9ce8cdb16c02c521a611c95b9022d9ba1de0