Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45451e575922950…

MALICIOUS

PDF

98.2 KB Created: 2021-04-01 19:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d027e070c924a53d8fb90ab2f9cf7bb6 SHA-1: 2191c88bc5572525eecb7fd32c4945e72f002029 SHA-256: b45451e5759229501cedb7b14b8cfb3d5513d826478b048880dbc87726394036
186 Risk Score

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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for SEO spam or phishing. The embedded URLs point to various PDF documents, some of which are confirmed benign, but the overall pattern indicates a malicious attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/award?keyword=nfl+schedule+week+7+pdf PDF link annotation
    • https://cdn.sqhk.co/zosiwutu/jGqjfEw/most_popular_tiktok_music_video_download.pdfIn PDF document text
    • https://vesanawe.weebly.com/uploads/1/3/4/6/134602832/09c6154ef12238.pdfIn PDF document text
    • https://cdn.sqhk.co/vatukaso/if0jajc/32901179914.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/idRKhdI/new_england_colonies_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/jorafulati/XigvDgh/shadow_the_hedgehog_wallpaper_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/terupilenu/IPib0rR/bravo_browser_fast_download_ad_block_secure.pdfIn PDF document text
    • http://gajelifuluxapov.mywebcommunity.org/career_paths_art_design_teacher_s_book.pdfIn PDF document text
    • http://zuxuvikewi.sportsontheweb.net/begetukizosipufiji.pdfIn PDF document text
    • https://cdn.sqhk.co/sevijeruba/jcX5Cjg/best_lightsaber_duels_star_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/xakawituk/eogfXie/69209152651.pdfIn PDF document text
    • http://midarujiwuvi.mygamesonline.org/combiner_plusieurs_en_un_seul_fichier.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/QmibOkK/clash_of_kings_west_mod_apk.pdfIn PDF document text
    • https://sikiroradimer.weebly.com/uploads/1/3/4/6/134619363/0bdec8c.pdfIn PDF document text
    • https://pamarilu.weebly.com/uploads/1/3/4/3/134322341/1540882.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/NihhhAb/download_mod_bussid_motor_drag_racing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_bb6116904da74ea1a6e78deb1146989d.pdf?index=trueIn PDF document text
    • https://4228e3e8-6e56-436b-9c2a-5710a6c3a216.filesusr.com/ugd/e32dc8_4ed980268a124800a0e221e798fd95a0.pdf?index=trueIn PDF document text
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_1e6d3073820f49798d4dd26abddcbe5b.pdf?index=trueIn PDF document text
    • https://6db1e9a2-4282-4636-8d41-de07325ad911.filesusr.com/ugd/d97b38_1cfbe4fb420949c1ad4797da6154d3b1.pdf?index=trueIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_5d8f8f95934f495ba3e397a67b506e5f.pdf?index=trueIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_78592450c90740bd8dd12d73b7fffb40.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_b81e5bda85324ef3890bb5bdb08fc128.pdf?index=trueIn PDF document text
    • https://992bddda-184d-467f-a815-0165b41a2208.filesusr.com/ugd/69695d_e549fbb0d8984a009ff7e7db4b222f6a.pdf?index=trueIn PDF document text
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_85b6e8c2a1c04285b12d0bef53463099.pdf?index=trueIn PDF document text
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_2b6c49fe949a44a3a871165bd173a9e0.pdf?index=trueIn 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_off00013f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 5144 bytes
SHA-256: 5ebbae5456f43d47ec534f8678a117a69f9cc66ae9c2f84a92b236c578f975ff
font_01_sfnt_off000150ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EC 12284 bytes
SHA-256: e06f140c81865bff36fa2addbe92a1f28255ebf015f0d28bfc86654f0ec83e9d

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