Malicious PDF — malware analysis report

Static analysis result for SHA-256 855f2ad3fa9cd4db…

MALICIOUS

PDF

87.3 KB Created: 2021-03-14 05:20:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c578c83a343a9346e77f317e64c26566 SHA-1: d27abdeb3422b15ebb23377ec0cfb5f849e957c4 SHA-256: 855f2ad3fa9cd4db05c9ec9506dced3d4af4bdc4b0c8b704413d8861be9b212b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm for SEO purposes, which is a common tactic for distributing malware or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/wix?keyword=supersmashflash2+unblocked+66+ez
    • https://cdn.sqhk.co/xotabuti/izWjdgT/stickman_fighter_3d_2018_mod_apk.pdf
    • https://cdn.sqhk.co/jirudumom/9wiiBDa/rebibivem.pdf
    • https://cdn.sqhk.co/sedasolegov/chajibm/free_html_email_templates_dreamweaver.pdf
    • http://wwnews.site/lyskamm_4000_guide_alpineg9u5c.pdf
    • http://itanto.space/bloons_td_battles_maymod_download1fbtl.pdf
    • https://cdn.sqhk.co/sobexofap/jGhbyid/kikoff_customer_service_phone_number.pdf
    • https://cdn.sqhk.co/luwibajik/emmjF7E/harvard_business_review_article_on_diversity.pdf
    • http://axecheat8.xyz/gre_psychology_subject_test1ra2x.pdf
    • https://cdn.sqhk.co/leburogutu/jjhgTOJ/neon_hockey_socks.pdf
    • https://cdn.sqhk.co/zofagopipowi/bMibgfY/dragon_quest_builders_2_wiki_rooms.pdf
    • https://cdn.sqhk.co/zumedizojas/dXicAid/retro_analog_bicycle_speedometer.pdf
    • https://cdn.sqhk.co/vobipibomuk/hdjfWle/stickman_master_league_of_shadow_ninja_legends_apk.pdf
    • https://cdn.sqhk.co/balaragu/I4hevge/photo_collage_maker_for_iphone_wallpaper.pdf
    • http://basvuruizleme.online/brainpop_states_of_matter_crosswords2vkb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://giwimev.rf.gd/referadenov.pdf
    • https://1d942ef5-affb-47d8-8f99-70a3d187b733.filesusr.com/ugd/3283b0_8a50d8f163c944b88637bfab7cecdaf3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2666b4d8-4733-4deb-8932-a237af48d863/53641715780.pdf
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_13bb71868ff94435bb3193d2cd9b3ae2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dda455d7-0698-4ae4-9403-6db78234dfdc/zoom_g1x_four_instructions.pdf
    • http://kexofiz.epizy.com/batman_killing_joke_movie_reddit.pdf
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_ddb147a7c5e94068832c50e646e5a657.pdf?index=true
    • https://aa4c2489-c93b-4667-afab-104bf5323bad.filesusr.com/ugd/8b49c6_d7f73f21453f439d8be46b45f0264fd7.pdf?index=true
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_61400a480ddc4d518d04ac6d6498fbd2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011833.bin
537800deb1b80800cace70edca3c05d36c367cdef3847ac19f3157158af50b85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 6036 bytes
font_01_sfnt_off00012c97.bin
91a9a6e1a083f04611db669be355a1547b2324cbd31be54c0917952c323bc8e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 10344 bytes

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