Malicious PDF — malware analysis report

Static analysis result for SHA-256 99fd962002ad429c…

MALICIOUS

PDF

98.2 KB Created: 2021-06-07 06:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d40cc8f8ddea0fd9afbdf14fdb829347 SHA-1: 40adb953f0f29b8ab5265aa985b0678da5c0204a SHA-256: 99fd962002ad429c7cfde985311e24aac2a55e8fddd385a5aa63bb1862a99905
166 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating it is a link farm on disposable hosting, with a specific URL pointing to a game download that is likely a lure. The presence of a 'Password-protected archive handoff' heuristic suggests the document is intended to trick the user into decrypting a payload. ClamAV also detected this file as Pdf.Phishing.Trojan, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/pbw?utm_term=super+mario+bros+3+apk+full+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6040ea7c015cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383467/normal_6002d60b6fa50.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/buguzujejif_lonevatil.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/tosuvotidalokivavip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449177/normal_5fe4eb69a64f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_604ca977a063f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460983/normal_5fdfd2b62e355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455894/normal_6005e1f2a6ca8.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/fuped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_6029fa41a2af6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495526/normal_5fde92fb35f10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5fce74328c6f4.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/xulupipu-vomoxumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a7a4a3-e0b0-4da2-9d15-e707b1c48634/stihl_leaf_blower_starting_problems.pdfIn PDF document text
    • http://sajateves.pbworks.com/w/file/fetch/144611496/creeping_death_lyric_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/935412c3-5017-43b4-b84d-b555979055a1/82002297148.pdfIn PDF document text
    • http://lomubel.pbworks.com/f/ribikunoxezizedigugikat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb1afc4-6c19-4f18-807b-004c796b9484/64327588886.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/potupokonomogefijup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b124a57-933a-4762-b949-55426baeca55/67046034755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8ad7aa-c7fb-4ea5-9897-e3b00def5e17/kodatani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ff00c1-c765-4a18-8a62-c6edbe42d093/lomidirifivonusitajenux.pdfIn PDF document text
    • http://raravisu.pbworks.com/w/file/fetch/144756273/latitude_and_longitude_worksheets_for_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f634aafe-f5a6-4411-b5ca-ec21fdbee212/rugolot.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 6744 bytes
SHA-256: 127b44c9f93874c96d25eb7ddc4688780d8877ce931cf296363fb5748d8d514b
font_01_sfnt_off000128f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F7 5752 bytes
SHA-256: e6d745b3d44f72eaf8227e32988c08d06a70a6505a76cdcd46667dff699a24bf
font_02_sfnt_off00013c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 11960 bytes
SHA-256: 7044c77d9433ed4744ec08afc978b48d005ffbd4fb35f9701245c17cc42c97d4
font_03_sfnt_off00016558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16558 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca

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