Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ea3be0dd11e16f…

MALICIOUS

PDF

77.6 KB Created: 2021-01-13 23:49:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: df72137d34fbfeabfa197c799c1f73a3 SHA-1: fbd33e7d037cd2d66e76ba206844d66b7d4dcca0 SHA-256: 36ea3be0dd11e16fdbda67c3bba5e25c4c3923f0a69f08e0c2670f703cdcd648
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains multiple embedded links, with at least one identified as a redirector to known malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting its primary purpose is to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/wb?keyword=pianista%20switch%20test In PDF document text
    • https://site-1175031.mozfiles.com/files/1175031/circular_piano_keyboard_price.pdfIn PDF document text
    • https://site-1194091.mozfiles.com/files/1194091/waves_vocal_tune_vs_melodyne.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/pwhctif/piano_music_maker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/PgcTwBO/us_army_infantry_iphone_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5ff1916ee3ae3.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/crYsmji/kelawonaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375080/normal_5fd918941f9cc.pdfIn PDF document text
    • https://site-1175150.mozfiles.com/files/1175150/99652480308.pdfIn PDF document text
    • https://site-1171956.mozfiles.com/files/1171956/pilot_flying_j_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/xRhaAyM/wibavazutilogemege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f93b81ac4156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_5fda92e5e91ab.pdfIn PDF document text
    • https://site-1229024.mozfiles.com/files/1229024/nuvawobosotebovenikoveme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/55218088843.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/multiplying_decimals_coloring_worksheet.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 4852 bytes
SHA-256: b43c4bd38dc853797a3f0a1f4cd2fcbc23375db867e4b22a407993c6933e8cbe
font_01_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 12276 bytes
SHA-256: 21df0b6449bcf437d0db0d5c47c3e5fa27e203b3c5140ebd4187978fd92481b0

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