Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1a8e1254f0689b…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 02:17:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51c88ad7ecd39e88d65101a08ef86c44 SHA-1: 3d00dd9f0231215b6e16d1defc7316e3f1a455d9 SHA-256: 1c1a8e1254f0689bf17f3521326059e836b234a81ad77a2c715d7840e4547305
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://oniceh.ru/uplcv?utm_term=j6%2B+android+10 PDF link annotation
    • http://facyt.com.ar/ckfinder/userfiles/files/11288455852.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/dapisorero.pdfIn PDF document text
    • https://angkagenap.com/contents/files/tofubovukosefumageluzagon.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/86771276664.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/14808355116.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/pijokigijubomakiga.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/pitowaki.pdfIn PDF document text
    • http://turatabor.hu/media/gunevufabijasanet.pdfIn PDF document text
    • https://labelmarket.pl/data/file/19813229380.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/81648266005.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e812922dd111b2427a5bc32b2f4497ab/jirigetatebemejamurozire.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/sodub.pdfIn PDF document text
    • http://hawaii-resort.info/images/blog/file/vemugemiwakejoxig.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/67312166756.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/jubajivo.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/xekivujugap.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83722999414.pdfIn PDF document text
    • http://npas.ru/pic/file/bigefapagafabekologe.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tixirokokezivuzemefizew.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/dexinomebonituzazekozitej.pdfIn PDF document text
    • https://shunnasato.com/51844617426.pdfIn PDF document text
    • https://aneri12.eu/res/file/6335806660.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/72563997641.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_off0000e564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 18656 bytes
SHA-256: d4514613c2e4555e53eb84a61ab1f4b870b11ccd31c17d003ae2eb5447bc6e2b
font_02_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 10132 bytes
SHA-256: cd5e3aca0090e0e551081a34ee54b126ad00213d533b70194416806f7ee7c048

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