Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51cf1a7fb647fe5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 05:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 5f3c5df9ee2364728a6ecd5e5e892c92 SHA-1: a729b99d9093d431e5d551df2a800a09594bd433 SHA-256: e51cf1a7fb647fe550792a98cab09707dfabebb6d019d0fc8596baa8a5ba0ec2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/9b3981600636bdbc787b1185a88bfb19/56585557795.pdf In PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/vaxokizebuwu.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/51744482771.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/6149301077.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/rifonimudubupifimon.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/94839209556.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/66070065587.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/zonakodatabag.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/totofe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/77058102513.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/23277610793.pdfIn PDF document text
    • http://liily.jp/upload/file/20210903072314.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/52298130092.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/15953177936.pdfIn PDF document text
    • https://fong-cai.com/upload/files/zesuvapufurekipen.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210906152524.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/93785901296.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a8347df4b3af84d14da00aa3c1075882/84299087808.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/fomurigowoxanotibovu.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/tapudatulovikodavenuru.pdfIn PDF document text
    • https://xeroxexpres.cz/userfiles/file/31900270893.pdfIn PDF document text
    • http://electric-kernbichler.at/91771396579.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/92817618145.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/94121172054.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/falulexisofupaj.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/jasomenetarusixadabe.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/telawuzufe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=need+for+speed+most+wanted+download+for+windows+7+32+bitPDF 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_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AF 16072 bytes
SHA-256: fd8a9372ade222dcf3149c1b7af35aad37c20798d6e15bbb5fab9fe1f15ee6fe
font_02_sfnt_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 11204 bytes
SHA-256: 1ccf302a142c8a3274dd01aa96d4d9c917b4dc4a00d5f01a0f176793abbc9b38