Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed16aad748491997…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 11:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b4f0f6b0440ef87e73a121ab3c8d7cf6 SHA-1: d638a4e8be2855cf83ca29d34a6b5b985504f41d SHA-256: ed16aad748491997717574cfae9e491c4abb511be45840d7e3e2932013387283
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded JavaScript stream and a large number of external URIs pointing to disposable domains, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=block+call+apps+android PDF link annotation
    • https://www.weboonline.com/ckfinder/userfiles/files/jolukexovuwekazejaf.pdfIn PDF document text
    • http://ashioke.com/images/library/File/9936109323.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/tizedenunipejoluga.pdfIn PDF document text
    • https://kermanrooz.com/img/files/24229503557.pdfIn PDF document text
    • http://zenkatsu.dk/files/zilirijaseg.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/ranaxiwutubepir.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1774869371613d000bb37d9.pdfIn PDF document text
    • http://hidropro.hu/upload/50355236945.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210919003836.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/66937238867.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/42578404668.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/34801980573.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/74913803532.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/besimofetisol.pdfIn PDF document text
    • https://hidropomp2008.com/uploads/userfiles/file/75570127879.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/riradekilegogozuma.pdfIn PDF document text
    • http://xhzhengli.com/upload/kuzigukimubelinulo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/96708989143.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210911101752.pdfIn PDF document text
    • http://precisao.org/files/files/4062966121.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455d08e00fc---99041984218.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413e576cde0---sojijos.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_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 17404 bytes
SHA-256: a9377ee22c0f7b781d11a1f78803f1248a7157873e86381e4daec374249cada5
font_01_sfnt_off00010817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 10424 bytes
SHA-256: d3d49cda63896e58023511ef07b564d510a67db8bc7ebe90dae41d792a927363

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