Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c434eba5b370ae1…

MALICIOUS

PDF

78.2 KB Created: 2021-03-24 00:27:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2c6110bae0ec14815fbb663767d8c4c0 SHA-1: ea735fab609cded91f4ea7fdfb0ba3181d5192a2 SHA-256: 8c434eba5b370ae18ef28cafb6e602dfd872d157faf81da6a745be68769cf882
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests a potential for redirecting users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://jacksth.ru/award?keyword=baron+psychology+book+pdf+download PDF link annotation
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/naxiponufesanogarowo.pdfIn PDF document text
    • https://cdn.sqhk.co/vefuwebilux/SWEDdjb/bundt_cake_recipe_chocolate_chip.pdfIn PDF document text
    • https://rejaduwewuwuga.weebly.com/uploads/1/3/1/8/131856140/botedegewapa.pdfIn PDF document text
    • http://powerhdniy.space/advanced_english_reading_comprehensionbgfaq.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/Phda0ha/sisters_1972_movie_poster.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/LjbT72z/crazy_racing_car_free_download_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/0Xggja6/vijay_super_tv_ringtones_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/icYEjjS/funny_wish_app_meme.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/cosmic_creation_hilton_hotemaofeq5.pdfIn PDF document text
    • https://xediziku.weebly.com/uploads/1/3/1/3/131384396/b1db638a6209960.pdfIn PDF document text
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/kuwudokimode.pdfIn PDF document text
    • https://zuriloteva.weebly.com/uploads/1/3/4/6/134623588/fawosuvenewosevaguju.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/gTLi7Ir/z_nation_cast_episode_1.pdfIn PDF document text
    • http://nukicew.xyz/6955811416044gzq.pdfIn PDF document text
    • http://1offpark.xyz/mimevexoki5bw9z.pdfIn PDF document text
    • http://rerixen.scienceontheweb.net/makisubiju.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/idpdQLe/first_strike_t15_fs_semi_dmr.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/ha6hb9u/stumble_inn_cannock_gig_guide.pdfIn PDF document text
    • http://imedo.ru/fubibonejazixedonidisamejd8fz9.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/how_to_set_a_armitron_sport_watch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/bichoo_full_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/photography_books_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/wemofodi/sales_process_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/kofemapajomi.pdfIn PDF document text
    • http://mifotabelimudon.myartsonline.com/convert_to_word_arabic_language_online.pdfIn PDF document text
    • http://sogivuwe.onlinewebshop.net/xagiwalazigaxux.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/tilexovarowaviseforawik.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_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 5864 bytes
SHA-256: 362ee89a9b3b616b1198e747558105899a14271c6be2d3abad2a2ee2b41f1553
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 11368 bytes
SHA-256: 2e56c8c1a1da29be64a4cdba35de79cc83501106f2275b5cb3f7b2baff00a25d