Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cda2ac7ec92c48…

MALICIOUS

PDF

75.1 KB Created: 2021-03-16 12:43:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a3f463f58224ca024b403906f0af4106 SHA-1: c846bf57c90fd624df08df5d468f97ddaead68f3 SHA-256: f7cda2ac7ec92c485234d46479694af57269c7f02856705db7d0f52d0a498729
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

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://leonvi.ru/award?keyword=isomerism+in+alkenes+pdf PDF link annotation
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/activity_based_cost_management_an_executive_s_guide.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/ad423e0282d0.pdfIn PDF document text
    • https://zegosonov.weebly.com/uploads/1/3/4/1/134109065/12b212.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/1936d7d5.pdfIn PDF document text
    • https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/2652124e46aa69.pdfIn PDF document text
    • http://dithetsen.xyz/psp_3_emulator_for_androidxfjef.pdfIn PDF document text
    • http://melowimaz.getenjoyment.net/nezoma.pdfIn PDF document text
    • https://volifutizur.weebly.com/uploads/1/3/4/6/134602954/4f269cabc2.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/50592e801d.pdfIn PDF document text
    • http://dream-stat.ru/33463279685iefnz.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/jagamozo.pdfIn PDF document text
    • https://bunojero.weebly.com/uploads/1/3/0/8/130874162/5611198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1fdb711-198b-471d-8cc7-f8b70bb562d2/verifone_vx510_security_alarm_bad_rtc_chip_please_reboot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e893fe75-f212-4933-bcb0-2b601d39de59/82719724862.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/40903019990.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/91348415606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0164a06b-6bee-4698-a2e8-045494ca10ab/79108608855.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/magic_eye_gallery_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c542737-7ce3-475b-99d8-8ddd3e9a1ac1/yamaha_kodiak_400_model_years.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/xewab.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/stock_dividend_payable_in_balance_sheet.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE851 5188 bytes
SHA-256: 50bb3543aa084ecc65d8c0fa5dd0f959328ec38516eeb5780e486f0a8b6f1988
font_01_sfnt_off0000f9df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DF 11060 bytes
SHA-256: 0134252bdc701e7bb59d0ee94a1cf27018fec06290189216d1ce19811ca16285

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