Malicious PDF — malware analysis report

Static analysis result for SHA-256 c281e52f55a68ec7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 01:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 419eb8fe0c96db49add07b6d02aaea16 SHA-1: 18e1a0f3cf61187e2e1894676e34990ec90f24fc SHA-256: c281e52f55a68ec74dfa987efd52a934b42a9021e5a7afa885f168896c1c0936
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, containing numerous links to other PDF files hosted on various domains. The presence of 'utm_term_redirector=True' suggests an attempt to manipulate search engine results or track clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://elsadaulte.com/ckfinder/userfiles/files/93590997085.pdf In PDF document text
    • http://ekhoron21.mn/uploads/files/42220114509.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/76602358706.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/3435161024.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202199657521627.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/kidadirex.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/jefajutuvuwapodizirojaga.pdfIn PDF document text
    • https://renetravel.ro/images/files/39597232828.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/95518903540.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b79166244---zapeg.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/doweroweletedijamoda.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/gusuxo.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/fepaweladalokupowa.pdfIn PDF document text
    • http://www.siposferenc.hu/html/fuzomomuzo.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/34321626753.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/84863873796.pdfIn PDF document text
    • http://sjhtractor.com/d/files/70790011255.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/53286866743.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/lhs4li6phcf56lk8hff7rvft80/3663675890.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/depunexakubiruravaz.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/53521660932.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/moxenokafoxikamubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+movies+streaming+onlinePDF link annotation
    • 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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 10492 bytes
SHA-256: 22dd568b13fca7748135ded6eed87faf6705438de8e196ff004538587670bcce
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 17344 bytes
SHA-256: 7f7fe940b03c69330bc80c1ad5fcf25e4d6b5abac6d017a8602c919e16341a31