Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b8822bfddd5749…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 16:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea09dc3d1e366c4172bc500ead00984f SHA-1: 2691a3947554f0779212cc5d926a88f775b0a89c SHA-256: e7b8822bfddd57492f9c5ee8709c935759e78a9d96c6e926108e9856dceb9aa5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded JavaScript, which is a common technique for executing malicious actions within PDFs. The PDF also acts as a link farm, pointing to numerous other PDF files hosted on various domains, suggesting a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kaies.cn/upfiles/file/xureluwug.pdf In PDF document text
    • https://sporyolu.com/resimler/files/55429585675.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/85146502947.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136b417760cc---13847824411.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/66800116106.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/kodikosamadu.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/tikevumijobuvegufibap.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/27903748029.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/tedumolufobava.pdfIn PDF document text
    • http://cecev.com/stockages/files/folapavita.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/42874952780.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/81271483339.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/lomewuzixatebi.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/53209728174.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/juluroludapiro.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/88161802678.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/18590094870.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/43345960191.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/lezomodut.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/29051403175.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/foxaxudugagi.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/24051121818.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/75962660742.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rexiziposopexiteborakeret.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/xixis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=essentials+apps+for+androidPDF 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_off0000bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FF 10472 bytes
SHA-256: 3ad1ba6548d62a9c7d6e676099c88de960d70384331bcab2713dfb98b7a9b4e2
font_02_sfnt_off0000eddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDD 17236 bytes
SHA-256: 818fae3729dbe26fd034d8d5d23f5ed652bde9515da3619006eb372e9de9c05e