Malicious PDF — malware analysis report

Static analysis result for SHA-256 718e3ad076851de4…

MALICIOUS

PDF

70.1 KB Created: 2021-03-29 18:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: afdb614c0ae17a43e743af1aa6eb4d72 SHA-1: 80c1a5dc990029e732dcb30bab685dbd647d4375 SHA-256: 718e3ad076851de4ad627d220c87dffb380047b35bb7d0557a611248585c8c34
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/wix?keyword=bruh+city+speedrun PDF link annotation
    • http://eeuuurrrrr.space/graph_theory_in_mathematical_logichv709.pdfIn PDF document text
    • http://reduslim-ufficiale.website/bionaire_humidifier_bcm655_manualjxpnw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452587/normal_6001c573baf84.pdfIn PDF document text
    • http://dithetsen.xyz/junior_waec_syllabusozxg0.pdfIn PDF document text
    • http://vykupavto54.ru/56144891128jcml0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477139/normal_600292f52f075.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485946/normal_60473f05cca2b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_7d3e482c2ae942ba92921c3504afd374.pdf?index=trueIn PDF document text
    • https://ccd4a2e6-63e2-4dcb-a02e-1ae1253dabcc.filesusr.com/ugd/059ff1_f23d5917adf84b36812e90ca637ed3e4.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_46d244499c504e299de452b21e976710.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/48707525102.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_33ce9f1543b84e9bb4a4a6ca46f9fb47.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/84323574202.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_5bd50dc86c87456086ee9ca729edff7e.pdf?index=trueIn PDF document text
    • https://8d9f32f1-468a-4e6e-8fd0-236262902e57.filesusr.com/ugd/28860c_34e09ae7459e456790e5baceb6d23177.pdf?index=trueIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_6fd0ede5ebd34b9bb9f59bd0c87bccea.pdf?index=trueIn PDF document text
    • https://ac25a69f-a984-4293-9c3d-8c9e0f062535.filesusr.com/ugd/cbf077_9984662dd4634e4b8a2c7b851e8a0216.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/74882206826.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_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 5068 bytes
SHA-256: 00b9adb7ed1d6c4064ca9228524994fcd0495553e2b380920f029f5de83e71b0
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 4892 bytes
SHA-256: c1cdacb88c8827529f4547a7002002991a3f57c572c05161715a32d9870482ce
font_02_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 10784 bytes
SHA-256: e68a158651eabbe992ac59f189ef60983d2092f99c2cb9389423e7e9f15a5c67