Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b640499abc0e649…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 01:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4380889a37c54b674d42981e4b4579c7 SHA-1: b0988bfbc4d09873608135204d0881f5e1225d87 SHA-256: 5b640499abc0e649da153d1815e93767360e8cbd7895978312aef5c0efd2c4ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with 'download+wild+blood+mod' in the UTM term strongly indicates a lure for downloading potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=download+wild+blood+mod PDF link annotation
    • http://daotaonhaccong.com/uploads/userfiles/file/wukazi.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/63447939292.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146569a028a7---30494810257.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/gavutakuraf.pdfIn PDF document text
    • https://conrays.ru/f/data/vemidavuferonazat.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/merelefawilijo.pdfIn PDF document text
    • http://samtekelektrik.com/files/tudomofukojabikalada.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/fekos.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/sutepalapezokoxulawe.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/xoseporunupegebejebixeju.pdfIn PDF document text
    • https://slicktechproducts.com/newerac2c/userfiles/file/170064109.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/83498040315.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/34394865106.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/56079494302.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/19629244018.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/15949599776.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/lafezanesafirotugakukil.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/91922257532.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210906_071411.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/vajatefuvusuri.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0bdf090e5---sikisifasij.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/pumeduriwijafom.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/jovonasabeposemubobebit.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/mimudiruwiwezikikajewe.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/79939502140.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_off0000e20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20C 10140 bytes
SHA-256: 16a6f4ee65cf3a67f46d03bc7ecad3b1be38570bd5c05d153e414707dc9f9b66
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 17228 bytes
SHA-256: 41ca54c88857fcadfccb8312d2b738594d9e194e911f79f0298580eac327722f
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1