Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5b7c632eba1f04…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 07:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bacf1d2e57437a59ab41dcf325ff1db SHA-1: f6c5710756f67b7036a109553f8037ad1dc75649 SHA-256: 0c5b7c632eba1f043e59e295e6f3660f9e1e4188816f57d34f7bb0eb7327573a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one with a 'utm_term' parameter suggesting tracking, and the heuristic identifying it as a link farm on disposable hosting, points towards a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure itself likely facilitates redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=what+do+i+do+if+i+forgot+my+pattern+lock PDF link annotation
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32862353379.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/texemibatimufes.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/96694605667.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/nenepasa.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/41019462446.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/rowakobapalunixuzudaxabo.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/mobizagugivowataluf.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/57776468825.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5g3l7dibgudn2avoebfm0uf82q/pizejuro.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/fafufonodepukojipomof.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/molaxifov.pdfIn PDF document text
    • http://artbaget.net/admin/ckfinder/userfiles/files/debitaxubejudofezoro.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24888888492.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/70317725809.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_172617.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kesedupudimekanabogexi.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/64776089314.pdfIn PDF document text
    • http://fencefactoryny.com/userfiles/file/53527636306.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/josonotiw.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/98177322494.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///tosorogojofimo.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-03/210903100807163403yone7cyc2tnu.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/85800646453.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614218ca95748---86090233867.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/fetebigezolile.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_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 19096 bytes
SHA-256: 09652f1b9d65b9d8a0b0cb1c9e99ee6e97cbf2d224ecb2c41228f95d5ba12e9c
font_01_sfnt_off0001123d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123D 11100 bytes
SHA-256: 9050014fde742ce4e646d3c5fef288fe19ba23bdb0ab268ed2bc90621f63e576
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1