Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae0b21f0bc00d79…

MALICIOUS

PDF

85.0 KB Created: 2021-05-12 00:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 49c291944f378fc4b2eb7bcb0806e864 SHA-1: b5eff4ee3deba8dfa6d8232138555cff04dbf78c SHA-256: 9ae0b21f0bc00d795b09616479b891f48a165945f1bc195be36dea33522111da
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also flagged the PDF with high confidence. The document body text is heavily obfuscated and appears to be malformed, preventing a clear understanding of its intended lure. The presence of multiple links to disposable hosting further supports a malicious intent to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=como+se+cosecha+el+arroz+integral In PDF document text
    • http://shoop-ff.ru/64164539112eayyy.pdfIn PDF document text
    • http://leoidet.xyz/rejepozexefenadirufazi0l0q9.pdfIn PDF document text
    • http://swiss-gear.store/pixma_mg3520_wireless_connectionk8zz8.pdfIn PDF document text
    • http://joritukuw.iblogger.org/wogujodojagevifepowaba.pdfIn PDF document text
    • http://nosaraxes.22web.org/ssc_stenographer_2018_application_form.pdfIn PDF document text
    • http://monajip.iblogger.org/patterns_of_enterprise_application_architecture_github.pdfIn PDF document text
    • http://pocki.top/daladuborobapatomiduzw8o8f.pdfIn PDF document text
    • http://teksol.xyz/8443157530a1gad.pdfIn PDF document text
    • http://pollsexpert.com/61005978506vzj6i.pdfIn PDF document text
    • http://onlineeshop24.xyz/christopher_martin_let_her_go_mp3_download_musicpleerffezr.pdfIn PDF document text
    • http://udilische.club/baal_veer_title_song_video8heln.pdfIn PDF document text
    • http://lezepubaj.iblogger.org/hydralazine_drug_card.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_241d9aed412f40248a560d907cf22aca.pdf?index=trueIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_4061e837d51644e28a7d8cd43a35a772.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/16448059908.pdfIn PDF document text
    • http://sejizokipex.rf.gd/98670844194.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/fury_warrior_pve_guide_8._2.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/wavelet_transform_on_image_matlab_code.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_0c7a69ed76c446309453e5e6989d1b5e.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_0da72e1eab314c6f80487468b4341dcc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/free_movie_behind_enemy_lines_2001.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/calypso_non_stop_songs_free.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_b18bd8004c14479d9b0ed5c1e99d31bb.pdf?index=trueIn PDF document text
    • http://tudutov.rf.gd/coaching_and_mentoring_interview_questions_and_answers.pdfIn PDF document text
    • http://pomirunorejuso.epizy.com/impulsive_buying_behavior.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E8 5168 bytes
SHA-256: 56e7e334e423c02a16521b5d3de6ba84b3b29c41edb22ff5a8d576d0a5002f3a
font_01_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 12092 bytes
SHA-256: 53395b135e99693c06343886d54799b9ddc879ed721f478545cacadc03b895e2
font_02_sfnt_off00012ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF8 16344 bytes
SHA-256: f3b95f1269985bafc3dfb9b5b35e76df8a4d57039a143c013aed99c7cf3a4a89