Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27c7c243dd473b5…

MALICIOUS

PDF

71.1 KB Created: 2021-01-18 19:39:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 676801c2286816230928b0a4be80fc99 SHA-1: 530223082c2f54717fec1629cead4e9a352b485c SHA-256: d27c7c243dd473b585237028fad9f0239920d0494410123b321b5a1898e519ed
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain text related to a guide, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/123?utm_term=audels+carpenters+and+builders+guide+1923+pdf In PDF document text
    • https://cdn.sqhk.co/novimabe/rifrsbb/70451664464.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/hgMa9ih/burger_big_fernand_nice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392661/normal_5f9eb6a61afee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417405/normal_5fbc6b4080b96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465705/normal_5fcf0afdded73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500678/normal_5ffd56f0bb336.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/xlLzDig/5218346739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luzutajezilako.rf.gd/fbi_tv_series_2018_episode_guide.pdfIn PDF document text
    • http://damabop.epizy.com/pifoxev.pdfIn PDF document text
    • http://tiwemevi.rf.gd/infection_control_study_guide.pdfIn PDF document text
    • http://jijetebum.epizy.com/baby_laughing_ringtone_in_ramaiya_vastavaiya.pdfIn PDF document text
    • http://bomepexajusopa.epizy.com/teri_meri_kahani_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/video_er_windows.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/mevemo.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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 5956 bytes
SHA-256: 7c448562bb059a06c493725b4216d4a2070b2f69ffb573d521e5d009855da6d1
font_01_sfnt_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 10748 bytes
SHA-256: b7d9bdd37708308c3dbe47a444ea84e7a00dd26532bc83a5895f62c27b721c7a

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