Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05c54aac73f0d84…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 07:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0dcee3ff62ed3dc012857b053304bd70 SHA-1: bc2d51b910f56303d4e9897caadd75665df0f86c SHA-256: c05c54aac73f0d84e2e50731e06d883be3369e45bcac7b97954aa10a0041094e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing links to algorithmically generated URLs on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://thebankcardservices.com/uploads/files/bepasafefunomadifukidij.pdf In PDF document text
    • http://pjcwyy.com/upload/file/josirofujutazupusubov.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/42022285500.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/82338635056.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161426d2f952ef---xigebawidik.pdfIn PDF document text
    • http://e-district.org/userfiles/file/20929355556.pdfIn PDF document text
    • http://idcla.net/upload/files/xoritujekipiboke.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/71743018870.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/53289631195.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091805561744.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/51834746667.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/18542454351.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/38004463301.pdfIn PDF document text
    • https://carpenterstouchnj.supremeroi.com/FCKeditor/file/nawolerutafof.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/pufepival.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/10031604614.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/97229949398.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/moliwebijorewek.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/94045976743.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/6308848463.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/70453983054.pdfIn PDF document text
    • http://quetthe.com/upload/files/713595521.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/tixumimuxivan.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/43221291014.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/35510147689.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/67726707110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=turbo+free+vpnPDF 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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 10056 bytes
SHA-256: a49ba2c2dcd2da53373e72e38d68bdcae9b7ee855746123723f3d1f63687a449
font_02_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 14276 bytes
SHA-256: 8f42b0af63fb3d5590e6d7e6eb94038938a0012776fd8a19e6542b0324f5d2bb

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