Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2cd3b03f26602d…

MALICIOUS

PDF

72.7 KB Created: 2021-03-30 17:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4c4c9c84f48889a6f6f236d6134d716d SHA-1: d56eaf2e279510353eb2c745f55530e1b3a88714 SHA-256: dd2cd3b03f26602d2c38d3f61409cdd0a2ad3c5e4211580cf6eab8bb61a018ba
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of external URIs and the overall detection profile point towards a phishing or malicious content delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=periodic+table+sat+chemistry+pdf PDF link annotation
    • https://cdn.sqhk.co/rizijuwet/bwFhbqg/horse_jumping_games_to_play_for_free.pdfIn PDF document text
    • http://erogan-oficial.site/what_are_the_types_of_transition_in_powerpointc3xam.pdfIn PDF document text
    • http://afracheat9.xyz/how_to_use_almond_milk_in_smoothieszyv0h.pdfIn PDF document text
    • https://fusemikak.weebly.com/uploads/1/3/4/6/134649426/3163217.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/XhiLr8y/telegram_download_folder_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/wametofenuwo/gY3hc0M/mowiguvebu.pdfIn PDF document text
    • https://cdn.sqhk.co/bofifolave/BLt3hhO/91803762895.pdfIn PDF document text
    • https://cdn.sqhk.co/lisakopew/hfTifc5/dr_bingo_video_bingo_slots_games_mart_ltd.pdfIn PDF document text
    • http://savisorafupodar.22web.org/39487459160.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/falepo.pdfIn PDF document text
    • http://remontlegko.info/how_to_read_kawneer_wind_load_chartsry9z1.pdfIn PDF document text
    • http://tovelksa.website/57891530985bbvww.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jeXuIgf/5725498370.pdfIn PDF document text
    • http://trackengine.host/sasuremopageboriv90gwz.pdfIn PDF document text
    • https://bigifami.weebly.com/uploads/1/3/1/4/131407708/wugekuvojaneveviseg.pdfIn PDF document text
    • https://cdn.sqhk.co/refevebux/jiXghhd/koravadusilukod.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/mitosesulodoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigitepusiligo.epizy.com/salam_alaikum_harris_j_video_song.pdfIn PDF document text
    • http://pisozixibole.epizy.com/pupebutanaxe.pdfIn PDF document text
    • http://gowepuxajotezo.onlinewebshop.net/beclometasona_efectos_adversos.pdfIn PDF document text
    • http://xasonivuk.epizy.com/input_output_function_tables_worksheet.pdfIn PDF document text
    • http://fuwotimusajitos.rf.gd/boxinurupubugeputime.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_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 5640 bytes
SHA-256: 561170c4ff7acfeffc1bc91ef1c1fe929f64df67a15f7b78328eb888c99526aa
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 10024 bytes
SHA-256: 21fb247a23e3dc52c9811366d0a2f491ad4664a724c4c4fcdea8df053d8a8b65

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