Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf2e7e44284419f…

MALICIOUS

PDF

80.6 KB Created: 2021-06-14 15:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3503c4a7ebb567e469fec4a18fad702d SHA-1: 6642a5637dd1d175ca00a891cb9746507921073c SHA-256: fbf2e7e44284419f4afd739cb542f767d6cc639467382850e2c84d0758772308
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, with one at offset 0x8938 pointing to 'https://cructi.ru/pbw?utm_term=pubg+mobile+original+sensitivity+settings'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest the intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://cructi.ru/pbw?utm_term=pubg+mobile+original+sensitivity+settings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417315/normal_606303d3406ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_6051f2b011e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371812/normal_5fcebd796a272.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63d41c3-74bd-4e96-93a3-d795e39fc90a/what_could_be_the_reason_for_fridge_not_cooling.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/pirates_of_the_caribbean_tamil_full_movie_watch_online.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/w/file/fetch/144415356/nolajakajifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c6a5a8-c0ae-4cdf-be9c-b5d5f2b84abe/zorodipinupisanaloxobafed.pdfIn PDF document text
    • http://saxonax.pbworks.com/w/file/fetch/144754932/how_much_is_a_girl_guide_50p_worth.pdfIn PDF document text
    • http://ronojew.pbworks.com/w/file/fetch/145226550/filmora_crack_without_watermark_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb0e90c7-e03f-4319-92bf-c23c6539e4b2/chandogya_upanishad_sanskrit_text_translation.pdfIn PDF document text
    • http://dagomiwavi.pbworks.com/w/file/fetch/145276734/mkv_movies_download_hollywood.pdfIn PDF document text
    • http://kigofot.pbworks.com/w/file/fetch/144851040/how_to_write_a_good_performance_self_review_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1029c226-7b59-4f65-bc42-cf15e2cc6586/who_are_the_clergymen_in_letter_from_birmingham_jail.pdfIn PDF document text
    • http://rukutuxeriro.pbworks.com/w/file/fetch/144555282/365_room_escape_game_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f70b0a6-ff62-4956-a860-6b7ddacf075c/gagekisukopebujezipo.pdfIn PDF document text
    • http://luwapoveduvi.pbworks.com/f/vevuzapajo.pdfIn PDF document text
    • http://fadoposapat.pbworks.com/f/apeman_trail_camera_16mp_1080p_wildlife_camera_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e88b53-9efd-4987-8483-8d90ccbe04a9/dizenazasavo.pdfIn PDF document text
    • http://balejuw.pbworks.com/w/file/fetch/145066323/drake_take_care_full_album_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f5abf2-0d2a-41c4-83f6-489cba731e70/42752952934.pdfIn PDF document text
    • http://lexibitite.pbworks.com/f/8544958729.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/endothermic_and_exothermic_practice_worksheet.pdfIn PDF document text
    • http://mogulazedub.pbworks.com/w/file/fetch/145295328/76929522956.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/w/file/fetch/144725157/dakomojanavuvasugegavap.pdfIn PDF document text
    • http://bidudilobofu.pbworks.com/f/kaduxagigaxisowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c41ecc-278b-4acb-9cce-1f049f9737d1/6420926731.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE666 5308 bytes
SHA-256: fcda05c93bee2e23a6392b9d65934608ff7167e76e23aacb85d43bc47281427b
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 10816 bytes
SHA-256: e622dcbed5f13db6642df4fb9fff23d2f7695103dc0f364da0a9cf874fd7c02b
font_02_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16168 bytes
SHA-256: 794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8

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