Malicious PDF — malware analysis report

Static analysis result for SHA-256 b100897c6cb89f6d…

MALICIOUS

PDF

87.8 KB Created: 2021-02-19 01:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9a4fc230dddd4b6509af860296c65819 SHA-1: 93736d683d81702a35f3aabfa86e3d192c891f04 SHA-256: b100897c6cb89f6dd858622e6b200f0d5900bb607c479aab76b713c110623b93
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 0.9997

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://crophysi.ru/wix?keyword=8th+house+sun PDF link annotation
    • https://cdn.sqhk.co/xejudawadoni/phhgejc/gexobigagonu.pdfIn PDF document text
    • https://cdn.sqhk.co/nupumusu/fgdbWjd/assist_dental_practices.pdfIn PDF document text
    • http://storezone.info/buku_agama_agama_dunia82ib0.pdfIn PDF document text
    • http://prizinsta.online/kulekelupuzelonawa9rnxn.pdfIn PDF document text
    • http://chebsvet.ru/rakshasudu_chiru_songs_freepvofk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492871/normal_6012642eed27e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485579/normal_6008730060368.pdfIn PDF document text
    • http://justamorem.com/conception_2_ending_guide64l3t.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/7jhaFZL/vumimiwijubudabeg.pdfIn PDF document text
    • http://galoomer.online/dixie_chopper_blackhawk_owners_manualltj3z.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/what_does_the_arrow_in_a_chemical_equation_meangnmsj.pdfIn PDF document text
    • http://card2card-perevod24.site/borror_architectural_review_form8l2wf.pdfIn PDF document text
    • http://wejnpowk.space/515062867076v5vj.pdfIn PDF document text
    • http://hookup154.online/compare_and_contrast_fiction_passages_5th_gradetkpxq.pdfIn PDF document text
    • http://phtech.site/63191324031xzlhx.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
    • https://s3.amazonaws.com/tojazudibumogab/52781333002.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/90428699801.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/47737533890.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/petevaxusonulelubusulepi.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/python_flask_template_table.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 4368 bytes
SHA-256: 356bf6ff6f3328034cca29284315679acf546a2b06ad3c0f267fbba34f67a51b
font_01_sfnt_off00011fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBD 10592 bytes
SHA-256: 40b61822e6313bf0c72fe1f8c13c9349507e121e1c360b84ebeb4861d7f51b2f
font_02_sfnt_off000143ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143ED 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176