Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93ee69a76407706…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 11:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a137a1ac5a5f05866f944740f40acf3c SHA-1: 3e892ed384c7d1cff334633a6247d68dc7e3da8f SHA-256: d93ee69a76407706355d98fe68f44eb955f188136d09f63b04280b9dae37c3d3
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an image-based lure designed to trick users into clicking an embedded link. The document body is heavily obfuscated, but the presence of numerous external URIs suggests the primary function is to redirect users to potentially malicious websites. The ML_NYX_PDF_MALICIOUS heuristic and the PDF_IMAGE_LURE rule strongly support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://nomylo.ru/uplcv?utm_term=sms+backup+and+restore+android+to+iphone PDF link annotation
    • https://nazrabilisim.com/calisma2/files/uploads/saruxotat.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/5819210526.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/nexomixuji.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/77543342181.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/pawawefolokizureriv.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632899993.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/pobixujanofotid.pdfIn PDF document text
    • http://pasaru.com/upload/files/xaxodij.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/jitiriwefo.pdfIn PDF document text
    • https://anctools.com/ckfinder/userfiles/files/44634004978.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6fe71c9420ddc452d794d5c00b74ee10/lupalunuwifevodan.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/27212292656.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109250417503868.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414e740644f---23458243169.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021925613484163.pdfIn PDF document text
    • http://domuran.pl/files/file/24917295635.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/33601935158.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210902135452.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/23093022027.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/wokopog.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/70674062761.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_off0000ada1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B8 11140 bytes
SHA-256: 72d03b61d5e27d0fdab82d016c2cf13ab7289aadfb35bc2a809190629982bdf6
font_02_sfnt_off0000df53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF53 14012 bytes
SHA-256: 3735014be0b7f48d82877ee4bd7d404259da2258fa283788c2e2430e1fd1808a