Malicious PDF — malware analysis report

Static analysis result for SHA-256 a618ac9d5e95e7eb…

MALICIOUS

PDF

85.1 KB Created: 2021-09-22 23:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 471f4735426346c0ec5ac79f7823f593 SHA-1: c423cb5fa35feed4811910fd7a2a371d2bd08b5b SHA-256: a618ac9d5e95e7eba3d58edf23381f4ce15acb7d4e20572fda4752381564c21d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or scamming operation. The PDF structure and embedded links indicate an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=swordsearcher+app+for+android PDF link annotation
    • http://files.ibiza-ferien.de/file/97014627003.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/birejedabo.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/buvipetob.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/vibupizasepexifudi.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/14147959378.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/9062363635.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/bofuzajepapodezuw.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/32926722414.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/22775948861.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/52252709324.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/2556553194.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/27457812657.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/85727661585.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/44494188832.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/98941005152.pdfIn PDF document text
    • https://matratva.in/userfiles/file/jilinukamam.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb1dc09d---92208257605.pdfIn PDF document text
    • https://mmszke.hu/files/file/muvuxalagul.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/desajifuvinezonugadu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/13723575755.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/fewuserinipovepotejini.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/40488628949.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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 18056 bytes
SHA-256: 010ab80c89b9d2f81fb225132c79c52ac118ba9b4ffcc9fa460822b1dbca5173
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 10736 bytes
SHA-256: f52cfa8b2274652c2551dc446f035adca598108a0f3514cdd79da19dff63fd4d

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