Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b3db95540b823…

MALICIOUS

PDF

82.0 KB Created: 2021-03-30 02:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ccdcba7d391f2de9b55b8a44fcc5d203 SHA-1: c05859e9aac57b070fd632081977d9ca90acbd7e SHA-256: 900b3db95540b823a53c5e4dbe908a70b51ae1eab1360c28e17c6f2f4798e551
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 0.9997

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://jumiwimov.ru/award?keyword=microsoft+excel+test+pdf PDF link annotation
    • https://bemakidej.weebly.com/uploads/1/3/0/7/130739127/d6c511107.pdfIn PDF document text
    • http://tur8osale.site/vifasopelawarerykyr7.pdfIn PDF document text
    • https://fereganew.weebly.com/uploads/1/3/4/1/134131887/nilujutifujageta.pdfIn PDF document text
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/vavujemedajo-dipakifalaveruj-kujujoxig.pdfIn PDF document text
    • http://mifvideo.space/96863458490hlvah.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/a4585a4e74f4a6a.pdfIn PDF document text
    • https://dapevorejux.weebly.com/uploads/1/3/4/6/134695165/4440176.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/twilight_saga_new_moon_vinyl_record.pdfIn PDF document text
    • https://pimidunobesuxig.weebly.com/uploads/1/3/0/9/130970022/rojok.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://ovca.space/gender_trouble_judith_butler_buyd1d3v.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/televuwepeketisadoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rumalitufe.rf.gd/tensor_calculus_made_simple.pdfIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_ee33ba875d7d4ea7b37fe242333f1052.pdf?index=trueIn PDF document text
    • http://govujetimavex.epizy.com/god_bless_america_kate_smith_sheet_music.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_302c0fec89364a2ebabf564576e06a7e.pdf?index=trueIn PDF document text
    • https://f6142301-0c02-44dd-b2c5-62cf9b3cd0dc.filesusr.com/ugd/ebfdba_a05fb39d41fc4252881e5914f229a6cb.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_df44ceb9c5a74557a7c05e1baf58e147.pdf?index=trueIn PDF document text
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_494f828c690742368ccf344f5bdcc45b.pdf?index=trueIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_5fb30b0ca8d64917bd710d46e04b90f6.pdf?index=trueIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_cfe36a882418420c8c303b960e7010ae.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 5012 bytes
SHA-256: 4ff0505863d79ce038cc7aa0044e4d3e20d0075de94998c53f7b45571f0814bc
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 11536 bytes
SHA-256: 26ce17bf163b0e82bb8121d4bf58dcdb8055baca5101d870b620dbe93e193946

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