Malicious PDF — malware analysis report

Static analysis result for SHA-256 f344a50b3bcc4885…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 07:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5afd2cc2146da45b272f86658e77ccc SHA-1: f701a2cc64b9d9bde9bad0863f5e49330f825c14 SHA-256: f344a50b3bcc48859710924932c2c64f8a40b906d75c35b118553429db3e50e0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous extracted URLs suggest the document's primary purpose is to redirect users to a network of websites. These sites likely host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://www.cemeba.com/uploads/ckfinder/files/mojunulenigivukixodifo.pdf In PDF document text
    • http://houstontca.org/Content/uploads/files/32575415294.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/84871373231.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d2460cc8a---lisijobulojuxukisiwem.pdfIn PDF document text
    • http://techbis.pl/files/file/pobilagutabomir.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/66725793964.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///xipisutigu.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/80237149264.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/46750375282.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/vajadexewomolabutugo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/6996843129.pdfIn PDF document text
    • http://it-hair.com/userfiles/gutoxutisivozutukapazob.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/41294613922.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/13516285604.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/vapagezabatujiviguva.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/80203494012.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/kasujeramejupexixaliran.pdfIn PDF document text
    • http://gapp.fr/medias/files/tofovakusot.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mirelidi.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/62343274710.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/puvelujenimutotikaluk.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/jotejorip.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/loxatodimugafidiwagujo.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/1600062485.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/41960775850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ob%C3%A9sit%C3%A9+visc%C3%A9rale+femmePDF 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_off0000d66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7E 19372 bytes
SHA-256: 15e46610e9de2245a2d04e31990ad9cf9f548d1cf1fcdb86d0953da79a70fbb9
font_02_sfnt_off00011ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF5 10660 bytes
SHA-256: 85e29eee5337c144d437005936d445dce337f499dd99d4a638a05dfaedc72a10

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