Malicious PDF — malware analysis report

Static analysis result for SHA-256 a305b39bf8b8d27c…

MALICIOUS

PDF

94.5 KB Created: 2021-03-20 18:53:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 88f0c932001517f7b80aab5427458309 SHA-1: 5fc25d0820c0a358f8c0e267106615742c2a6a8c SHA-256: a305b39bf8b8d27c2423367477e4c175e97ce2f1e31492b474fc3876b93003af
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a link farm or redirection scheme designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/wix?keyword=ancient+rome+word+search+puzzle+answers PDF link annotation
    • http://pakimudemezir.iblogger.org/free_book_of_synonyms_and_antonyms.pdfIn PDF document text
    • http://pedaxofanor.mywebcommunity.org/easi_joist_price_list.pdfIn PDF document text
    • https://libadelalisam.weebly.com/uploads/1/3/4/5/134579317/vasabivukeva_fuzokateruzil_zonibi_fogibuxilusuzi.pdfIn PDF document text
    • http://xiwasaruv.66ghz.com/case_study_report_example_nursing.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/binocular_vision_and_ocular_motility_von_noorden.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/yibifjc/kung_fu_panda_4k_wallpaper_download.pdfIn PDF document text
    • http://desokob.22web.org/dedoralupinajovoka.pdfIn PDF document text
    • https://pupiwukonavi.weebly.com/uploads/1/3/2/6/132682553/28e89dfa8.pdfIn PDF document text
    • https://povemiloten.weebly.com/uploads/1/3/4/6/134608376/muboxebib_bujezotetewaze.pdfIn PDF document text
    • https://cdn.sqhk.co/xurinuwame/bbhheuO/fiximipiz.pdfIn PDF document text
    • https://cdn.sqhk.co/tefebenum/hf6hje4/86168244882.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/i9jcgjm/xbox_series_s_release_date_walmart.pdfIn PDF document text
    • https://cdn.sqhk.co/ragekasa/vhfFiap/durijuzefimoborirevezux.pdfIn PDF document text
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/vodumeburilapudorane.pdfIn PDF document text
    • https://cdn.sqhk.co/wazuzofi/ojetMQI/field_hockey_training_exercises.pdfIn PDF document text
    • http://gukiduwonaxinef.getenjoyment.net/kapumenafetit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/6713611573.pdfIn PDF document text
    • https://75e6d08a-b14f-4c2c-bd4e-3e6431d9d11c.filesusr.com/ugd/497a87_a33bcac4bb3749a399f69944b0e8e313.pdf?index=trueIn PDF document text
    • http://ripofosefalub.rf.gd/windows_10_backup_image.pdfIn PDF document text
    • http://buluperase.epizy.com/kemixifepavikaforatuga.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_58311341ff6c48e4b301e3bd295addfc.pdf?index=trueIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_03ce6166f64340209f7eea5b8a01cdc4.pdf?index=trueIn 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 3260 bytes
SHA-256: 7da6d4c8dbfeb32bd3119b6c182258c558f96d9b9ca684a136ce6b54334be7a1
font_01_sfnt_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 5444 bytes
SHA-256: 89976c3591f55463d42a2f51a649b2e5147b6f8a9c5cb7b3c5de7bb535501652
font_02_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 6636 bytes
SHA-256: 7ee6a260d27200cf4c9e3c52387cf54739e4672afbfdb64074a24a8b6ae32de3
font_03_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 11624 bytes
SHA-256: f1261f738e90616c8d98fa35894664a9b3cff3c2680fad64e1a53720abed9169
font_04_sfnt_off00015064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15064 18940 bytes
SHA-256: 00a318da9255d592a1cbdabe93db344f9d930201243fd85c89ffc163e14a9586