Malicious PDF — malware analysis report

Static analysis result for SHA-256 f724d53fc549819c…

MALICIOUS

PDF

68.4 KB Created: 2021-02-15 01:42:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2ef2343b234f7fa4209272af9d166d7d SHA-1: 91a756ce1dbb7fcac50bd11f632c9ca63198d080 SHA-256: f724d53fc549819ca36fb3149c0ab82d6a6372b122ff59d32e4922e6b0426060
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 the presence of numerous links on disposable hosting indicate a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded links suggests an intent to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

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://crophysi.ru/123?utm_term=dachshund+colors+piebald In PDF document text
    • http://detodefinedex.22web.org/indonesia_flag_hd_wallpaper.pdfIn PDF document text
    • http://wesaremujoworu.22web.org/gotranscript_audio_test_answers_december_2018.pdfIn PDF document text
    • http://help-feedback-amzn8.xyz/37813970958xudlq.pdfIn PDF document text
    • http://temppicture.xyz/report_citation_apa_6thvqvje.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/6d2a15488.pdfIn PDF document text
    • http://3bureaureport.info/apple_carplay_usb_dongle_for_android_os4q24h.pdfIn PDF document text
    • http://duzatizej.iblogger.org/xamawevixusan.pdfIn PDF document text
    • https://raguloduw.weebly.com/uploads/1/3/4/0/134041620/7438805.pdfIn PDF document text
    • http://svoydvalend.xyz/knife_master_vs_fruit_hite6j2s.pdfIn PDF document text
    • http://mejegumojotata.22web.org/5691128456.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377381/normal_6001040c1dfdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jatomije.rf.gd/odia_new_movie_song_2018_video.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/imf_report_on_pakistan_economy_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/quarter_fold_greeting_card_template_free.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_off0000d047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD047 5300 bytes
SHA-256: df02a01c020a24f6b9f283af84c992b3a493c607e68d5aac1b8899994ffc23d1
font_01_sfnt_off0000e242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE242 10120 bytes
SHA-256: b6758f1667946cb377b2d287483760efb8fa171296e8560ba5c6a89e79cde668

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