Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cda53a44bfe61c…

MALICIOUS

PDF

98.3 KB Created: 2021-02-18 03:40:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5e87081af4a0d29df1d690418cb1e81a SHA-1: 916aa19120de877eb02c8f43a4e2a24aa42c8107 SHA-256: 14cda53a44bfe61cd2020e2ae50400ea5c09f5d0901bc26d9a31391bd760182e
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure at 'https://yafferge.ru/strik'. The document body, though heavily obfuscated, appears to contain metadata related to the file's creation and potentially a lure. The presence of multiple links on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=one+thousand+and+one+nights+aladdin+pdf In PDF document text
    • http://kulixebuvalafin.iblogger.org/83642313804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_6014d57d06604.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/ghhgiZD/japupapegirugomukinesitu.pdfIn PDF document text
    • https://cdn.sqhk.co/roretuduva/heMBZrV/durapowewu.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/VS1WMji/vajegewowododasefira.pdfIn PDF document text
    • https://cdn.sqhk.co/pejemomet/ahjigia/bafatozemiluvutija.pdfIn PDF document text
    • https://cdn.sqhk.co/tabuguran/NZOgiB9/tetris_effect_metamorphosis_dynamic_theme.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/fnjeEjj/does_gopro_super_suit_fit_hero_7.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/Igdhcia/rapobipa.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/gjbjbCk/25457064225.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fe4f36cc9e47.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/yjhiriv/snowfall_season_4_delayed.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/hdKXjEi/14854232696.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/muxozuvalubi/canales_de_comercializacion_internacional.pdfIn PDF document text
    • http://waxozex.epizy.com/new_android_apps_april_2019.pdfIn PDF document text
    • http://vezuzatutuxi.epizy.com/attack_on_titan_game_apk.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/ags_algebra_2_workbook_answer_key.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12058 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_01_sfnt_off00012adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 5236 bytes
SHA-256: 506d86e917a584c8396fc5f7ee81b34419453bcde3b4d828c641bba6e6ab4ef7
font_02_sfnt_off00013cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAB 11760 bytes
SHA-256: 38f3b2ef9cfd04a23e1e2598ae5d4f77d55ecc1124ee1fa836fe2d8a53efc99d
font_03_sfnt_off000164f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F5 16360 bytes
SHA-256: a6ff16bf35bdcfd50178b8f55fe5be062977f17e052d738767233bdb270d39b0

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