Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f6af152e0795cd…

MALICIOUS

PDF

78.2 KB Created: 2021-03-07 06:59:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 149ad8d3472ec8fe4c1f9cc2fe6dc3aa SHA-1: ac502193404555c0a9c5b2d55ffd4a09cf10d454 SHA-256: b3f6af152e0795cdd9b4e2d8007c015234302519684a0c2f4ee5bf1630154f4b
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, suggests a lure related to fixing a thermostat, which is likely a pretext to drive users to the malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://vilenefex.ru/123?utm_term=how+to+fix+a+ritetemp+thermostat PDF link annotation
    • http://setopin.mypressonline.com/furotupoledojaguzotij.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/lords_of_chaos_movie_soundtrack.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/latest_oracle_pl_sql_developer_jobs_in_bangalore.pdfIn PDF document text
    • http://wobafobigo.mywebcommunity.org/6736451649.pdfIn PDF document text
    • http://opensalle.xyz/how_to_call_dish_tvw8vpo.pdfIn PDF document text
    • http://doorstepcomputers.com/the_insider_s_book_of_secretsd45cm.pdfIn PDF document text
    • http://damita.fun/rxprep_free_downloadt54zp.pdfIn PDF document text
    • http://avto-trokot.xyz/excel_advanced_skills_writing_workbookwsasu.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/the_heart_of_change_book_summary.pdfIn PDF document text
    • http://physcoo.com/112278003046odsf.pdfIn PDF document text
    • http://zutatowatipo.mywebcommunity.org/how_much_do_qa_testers_make.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/maus_ii_art_spiegelman.pdfIn PDF document text
    • http://ruwemipuwev.mypressonline.com/putitiwanajaladuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://saxodanokijaj.atwebpages.com/nafufazo.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_a44dbed8bfde4f95a796b376c1613f02.pdf?index=trueIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_edf9d4c099b741c28ac9fd1bae1a4143.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_ddb1f3fac37247ff9bd1672fda5504d5.pdf?index=trueIn PDF document text
    • http://zepuwiz.atwebpages.com/lemamatigobezisaxoxeji.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/homelite_2700_psi_pressure_washer_pump_rebuild_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/kegalemawasawapujesudup.pdfIn PDF document text
    • https://s3.amazonaws.com/kubedukowug/yokogawa_centum_vp_installation_manual.pdfIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_6bfb1c69c6254e3d97dd96a4d7b7ca70.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 4912 bytes
SHA-256: 881a965bf133cc21827c5b2e798c601dfeb330ead418e93cea2775a12d670ced
font_01_sfnt_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10504 bytes
SHA-256: 9dbfa5d86f904579fcf01fc6c180f3c5da2a6785b45829e08ed3adb59021621b
font_02_sfnt_off00011d34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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