Malicious PDF — malware analysis report

Static analysis result for SHA-256 83de9a0910d8b280…

MALICIOUS

PDF

91.1 KB Created: 2021-09-18 15:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e9c1c28f4718185df07788ba6794d386 SHA-1: f4f45ad17f9f3fb17070805efeff3829fbf1c33f SHA-256: 83de9a0910d8b280328c65a01f9938e3ea92c8184d3181ff79bd1c3835d51e30
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for malicious PDFs to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable domains, suggesting a phishing or scam operation. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://nhuaduongnhapkhauaz.com/upload/files/14803157676.pdf In PDF document text
    • http://flapboxes.com/userfiles/files/lifutali.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/jepovetusafudojuro.pdfIn PDF document text
    • http://axwelindia.com/uploads/36094302081.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/sanizelazemepefodapa.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20219101834329602.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/556de0f65f334d6c2797fc41eef1e5f8/46727920541.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/gajetulevalamadawenozuzi.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/pesabiwoziwis.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/rujelup.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/64773740603.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/gurelunagewe.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_092150.pdfIn PDF document text
    • http://annabarons.com/files/files/69708642637.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/42752925086.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/mukega.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/woxokoranij.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/86153701544.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/22953840972.pdfIn PDF document text
    • https://alpinashop.bg/files/44063285393.pdfIn PDF document text
    • http://shriramashramps.org/userfiles/file/kuzax.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/xokevatusofe.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/gawininiwabenorifarimava.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/xuvidikutu.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/dazulosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=iron+man+2+full+movie+123moviesPDF 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_off0000f905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF905 20248 bytes
SHA-256: 4cf242047c5e7128fc5e33c3594ec614e36eddd8d6b2e33f6d15ccb67c01b69a
font_01_sfnt_off00012dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFF 10740 bytes
SHA-256: 0eeced88d68bc5c8866f5cdea3b25c0b1c6a8e50e1b3bc58cec3edfd56f773bb
font_02_sfnt_off000146c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1