Malicious PDF — malware analysis report

Static analysis result for SHA-256 1619bf11d46a361f…

MALICIOUS

PDF

84.4 KB Created: 2021-05-02 22:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a067ccc4dfc9e2572f14d7f4ab671a3b SHA-1: 7aac0dd3db188273888414f4d7383a14f82a3b59 SHA-256: 1619bf11d46a361f2e87c022697e76f73d57227ea11c0f2566164589387a0d0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded links to external websites, many of which are algorithmically generated and appear to be part of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a "Zombie graphing worksheet answer key", aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://kuzutuzo.ru/strik?utm_term=zombie+graphing+worksheet+answer+key
    • https://vinosubolab.weebly.com/uploads/1/3/5/3/135316207/kenusubulad.pdf
    • http://notidokamokuz.22web.org/napatumemokomalojodi.pdf
    • http://golomashvanna.xyz/60131684173tykf9.pdf
    • http://centerverifybadge.com/bob_omb_battlefield_alto_sax_sheet_music1lfxe.pdf
    • http://privateguardingserviceagainstdanger.site/80241288333hvtch.pdf
    • https://gokokunebede.weebly.com/uploads/1/3/0/8/130874183/1306852.pdf
    • http://complect-tech.ru/simon_s_cat_pop_time_level_919xic76.pdf
    • https://munojafejim.weebly.com/uploads/1/3/0/8/130874523/jeliwuzigorek.pdf
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/2042460.pdf
    • http://oneitshop.info/141672264179ujdp.pdf
    • https://dovewonarada.weebly.com/uploads/1/3/4/6/134672256/gozojijozezefaxala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sixobujogek.rf.gd/ruvulegekazugaviposoveb.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_3a02cf9202b24560ba647833e5ee6abf.pdf?index=true
    • https://2ce49c0c-752a-49d0-a831-a69229ee2afe.filesusr.com/ugd/6e9521_15c2196261854e8eb0ef9eefad938e00.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a5daf63a-dfcf-4d0f-84a7-236ef9dad7a9/vibujubabososuxirezeto.pdf
    • http://xinovedef.rf.gd/how_to_mix_beat_in_fl_studio_20.pdf
    • https://uploads.strikinglycdn.com/files/34998a08-b9e2-4eea-8363-c9a1abc764c3/drivers_de_video_hp_compaq_8000_elite_sff_pc.pdf
    • http://sadamalaju.epizy.com/blue_jackets_new_red_jersey.pdf
    • http://wusekugu.rf.gd/vagasugedimepuwor.pdf
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_6b77150103864e0290768c5bbab98e81.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_off00010b09.bin
655d72314f7bec685c6990f1611779a3ddef93c2cad1cb0c82ea3fd52bdef073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B09 5556 bytes
font_01_sfnt_off00011de4.bin
16748c1e88dbbe674797e05854181d4ce0027ea616ffeb4bd7565237ede0b938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE4 11332 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.