Malicious PDF — malware analysis report

Static analysis result for SHA-256 812be91e343427bf…

MALICIOUS

PDF

76.2 KB Created: 2021-09-16 22:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd36bc7d7caf3a294885005b5778f15e SHA-1: 10c0d9562eca14f45645821274299f9bfd24ee18 SHA-256: 812be91e343427bf74bf29e375db5bac4d6dc39eb11a168a61677982e5d8e2ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm, suggesting it's designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://china-glass-mosaic.vegner.com/userfiles/files/20210907_155022.pdf In PDF document text
    • https://pmapmc.com/userfiles/image/files/sizotazumanajal.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/97493805834.pdfIn PDF document text
    • http://yanartextil.com/firma/files/78584337981.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131b94120f1b---mukutipafoguto.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/ruzuwulobajokotejelamizo.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/sajesu.pdfIn PDF document text
    • https://oferta.lt/i/File/77422963987.pdfIn PDF document text
    • http://ewtch.com/upload/files/nidetutawogajiwotixapa.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/figiduzipidodupuvolojovi.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/8263936438.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/84221697563.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109100109478277.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/73403252183.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dnie2acd962apiebuk8rgt2fsr/79589240827.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/16579811097.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/kowowe.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/15874028959.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/26381775514.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/dazisixerepukuwebidanan.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/81404056228.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/wewopifufofone.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mevukozigeparogaziratelaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=the+dude+in+me+eng+subPDF 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_off0000bc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5F 10372 bytes
SHA-256: cc7c36dc7cb732c45d47c45bf91fe1cd36e47142e09f84fd7f078f909f5af76a
font_01_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 21812 bytes
SHA-256: bcfb93c67563c7c78b7aecceb3b05dceb5a49a4fa8995e0027b73eccecd6b042
font_02_sfnt_off00010b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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