Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9e80ad0b2f9e15…

MALICIOUS

PDF

75.0 KB Created: 2020-11-21 11:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9c3df6dabc12cf5818ead7f52ff3c76a SHA-1: 4723eafc6220248a16103f83d1a31c9ff898d658 SHA-256: ab9e80ad0b2f9e1564e416f41f1216e201f6ae925ed071845f69d91095524d31
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or redirection mechanism. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to downloading 'assassins creed identity apk 2019', reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=descargar+assassins+creed+identity+apk+2019 PDF link annotation
    • https://dujefeva.weebly.com/uploads/1/3/4/5/134589135/xuxewojobasil.pdfIn PDF document text
    • https://gokaveruziniva.weebly.com/uploads/1/3/4/5/134580144/dekesaxujikamu-monopi-fakegumop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f8be0e972bd6.pdfIn PDF document text
    • https://rogakaroguw.weebly.com/uploads/1/3/4/5/134517982/moluwatan-newufivepe-dotas-rufena.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_5fb76189bad19.pdfIn PDF document text
    • https://kanolapegagidil.weebly.com/uploads/1/3/4/3/134339460/xegokonowudonajoxezu.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/pilezubaxakuro_giwavavabem_vupusuximikudum.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1ba6ecb-fa0d-4d29-9cc1-5e8317a0f796/21473116121.pdfIn PDF document text
    • https://s3.amazonaws.com/kizuporowefib/69788999816.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/4809849379.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/rikuwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5f02d0b-7aea-409a-985f-83da8c4aab40/latimasazowajavivos.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/vuterakujuxupumalejis.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/heart_failure_guidelines_diuretics.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001016a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1016A 18572 bytes
SHA-256: c76dfc25f2cd15a3d694a4e6f6ff7555ea15b3dcceb11129854f2b9f5812c4e2
font_00_sfnt_off0000c7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C7 5856 bytes
SHA-256: acdcb3156af31de85a3cd07843b43682e693a8d9aacf292ae482fb06dad3d6e6
font_01_sfnt_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 10936 bytes
SHA-256: 57fd3f4573d073eef2085a9c425cbdaf29b6433389edf06bcbc9f6142ec83939

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