Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ff1a3293489c2f…

MALICIOUS

PDF

67.2 KB Created: 2021-02-17 00:45:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 60df526dd2096fb1df2ba3e8714bf083 SHA-1: c024ac1ba8c8a853d598a60eb3198355c6d809aa SHA-256: 44ff1a3293489c2ffd3310d9cdd68ce167482c6f7d278517cacef6de9224fabe
124 Risk Score

Malware Insights

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

The sample is identified as malicious by an ML classifier and contains multiple embedded URLs, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a watch and software, suggesting a lure. The presence of numerous links on disposable hosting further supports a malicious intent, likely to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=zegarek+m%25C4%2599ski+timex+ironman+triathlon+30+lap+shock In PDF document text
    • http://tobalalupuvobiv.iblogger.org/elastic_beam_theory.pdfIn PDF document text
    • http://rujawobezixevib.iblogger.org/dmv_written_test_questions_and_answers_tennessee.pdfIn PDF document text
    • http://spencermcman.us/vidmate_video_er_new_version4xkms.pdfIn PDF document text
    • http://zuwazari.22web.org/25199599393.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/91782359062.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/N5jb3jh/infinite_painter_ipad_price.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepiretivixu.epizy.com/spam_bot_discord_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/google_assistant_apk_latest.pdfIn PDF document text
    • http://medesawawolujim.epizy.com/51143828366.pdfIn PDF document text
    • http://losisotudek.epizy.com/25086665406.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/cartoon_hd_app_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/falejogajir/least_common_multiple_in_fractions_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_off0000c59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 5924 bytes
SHA-256: 517837370d393582c84d45b2f048c01adf03c4076df7d23fcedc9b6c1c0f6faa
font_01_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 10540 bytes
SHA-256: 3521d94cc13335f40e1274e930c6ef67495e0a7f7f6c3a9fdb135c5b0cf5ed50

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