Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5a1bce72e1308c…

MALICIOUS

PDF

101.4 KB Created: 2021-04-06 17:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ac46364a200d9f0145eb9bb6a938cc80 SHA-1: e5ec2f969d451e916f6061d4915bca715cb1b6de SHA-256: fe5a1bce72e1308c5c538311d2671a6b2fc96ed5327d7cda9fafe2ca358d908d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://botokaw.ru/aws?utm_term=what+is+the+formula+for+area+and+perimeter+of+a+triangle PDF link annotation
    • https://pixokunotozonux.weebly.com/uploads/1/3/4/0/134017876/422645.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • http://fojozefamofu.22web.org/39233121162.pdfIn PDF document text
    • https://wegusolojemirub.weebly.com/uploads/1/3/4/5/134597015/c996f73cd050d0b.pdfIn PDF document text
    • https://ruzopujiwinor.weebly.com/uploads/1/3/1/4/131452977/2745718.pdfIn PDF document text
    • https://pusazaninad.weebly.com/uploads/1/3/4/3/134358808/jezifilozozufaj.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/gw6Xijh/60933410551.pdfIn PDF document text
    • http://zulurasovuguloz.66ghz.com/vavowebarewufanidov.pdfIn PDF document text
    • http://jogedisilokazex.iblogger.org/tafugalibenupuritibop.pdfIn PDF document text
    • https://zorisurirumu.weebly.com/uploads/1/3/4/6/134600588/1356716.pdfIn PDF document text
    • https://cdn.sqhk.co/miviluwulux/NggNapJ/jejupesenuwodudereme.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/agfjihi/tripeptide_fish_collagen_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/TtDaGhi/1829160125.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://fakuvamikopevi.rf.gd/51335625074.pdfIn PDF document text
    • http://ribaxekag.epizy.com/spongebob_running_away_meme_template.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/99288059684.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_b9355979ae24405198fd82adce0ed9b3.pdf?index=trueIn PDF document text
    • http://sesukunijekoti.epizy.com/charlie_and_the_chocolate_factory_characters.pdfIn PDF document text
    • http://sosumanaxixit.epizy.com/electronic_devices_and_circuit_theory_11th_edition_solution_manual_chapter_2.pdfIn PDF document text
    • http://subedawulowuwo.epizy.com/intravenous_fluid_therapy_guidelines.pdfIn PDF document text
    • https://1b65b899-5fad-42bd-af9e-a3fb1d6a4c80.filesusr.com/ugd/a2ebd8_39a99ffee6fa4184bf76bdc6f98749d2.pdf?index=trueIn PDF document text
    • http://bawokexumavi.epizy.com/ost_aladdin_2019_prince_ali.pdfIn PDF document text
    • https://ff102949-4c65-4b7b-925c-ea9a98d885fa.filesusr.com/ugd/7a16bb_9626118299e64be1a7febfeec0e4b927.pdf?index=trueIn PDF document text
    • http://tanadumowijilum.rf.gd/xubekesopan.pdfIn PDF document text
    • http://nisoruv.rf.gd/19157279172.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12665 5348 bytes
SHA-256: 35a47fdb941298e31c7df4d18914078e86525c8eaa9c270ead6ce9752eb79c5a
font_01_sfnt_off00013873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13873 13028 bytes
SHA-256: 84765b41105cd98ae9c0f8eeb5930a587ef884f74a63f1ef780275720a6587ae
font_02_sfnt_off00016360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16360 16200 bytes
SHA-256: 42b0846ac6113f46755d56e5733f7954f7439ef113d6ca86cadb2acad987c7d4
font_03_sfnt_off000178a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178A7 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176