Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8d66870ccbbce7…

MALICIOUS

PDF

74.2 KB Created: 2021-03-12 14:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fab2bec21b39b17918abe4db42ee7cd3 SHA-1: 90638bca3e85200b76b4ba8fd5180ffbac518c61 SHA-256: aa8d66870ccbbce78b42ceff75b2ae0edc0e34868f4dacc11f98cd47c84b0567
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://lozipotod.ru/strik?utm_term=5th+grade+vocabulary+word+list+pdf PDF link annotation
    • http://gejulavofanutar.mygamesonline.org/galolizufugebazuvuv.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/42130339199.pdfIn PDF document text
    • http://pasetbs.xyz/used_motorcycles_for_sale_by_owner_near_meum6un.pdfIn PDF document text
    • http://wopivobozas.66ghz.com/please_find_attached_our_proforma_invoice.pdfIn PDF document text
    • http://yoga-fitness.space/american_gods_season_3_cast_imdbh5r8g.pdfIn PDF document text
    • http://vofitoweba.22web.org/the_sparrows_nest_athens_ga_30606.pdfIn PDF document text
    • http://basvuruizleme.online/cessna_340_costy3gyn.pdfIn PDF document text
    • http://zoo-taxi.site/54291232042fy9gi.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/lg_lfx28968st_water_filter.pdfIn PDF document text
    • http://zdorovienashevse.xyz/asus_rt-ac68u_specificationsxn5el.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitojaxekeveki.onlinewebshop.net/important_days_in_year_in_tamil.pdfIn PDF document text
    • http://moretavumafoge.epizy.com/brother_hl2240d_toner.pdfIn PDF document text
    • http://pulawev.epizy.com/feltham_yoi_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25b9363-5cfb-4f8a-a0c1-aa3571bd8af2/rules_for_knights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0731cf0f-ebee-4e4c-8aef-752fd2b4c388/nubije.pdfIn PDF document text
    • http://luwefotikejumu.rf.gd/functional_analysis_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6809234b-2f77-4141-a9aa-559d742005bd/nivewazalowujepunof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b81c835-0632-435a-ac6b-f6fa4c925198/mumub.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_off0000e4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FB 5840 bytes
SHA-256: 3e9625b6d3533a4db123a0aa3d1d5baaf38a126de4573ab659af5e715dbd9e5a
font_01_sfnt_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 10208 bytes
SHA-256: ee804d251a93422f51e645937bac730a8a3a133fb4dec48818b67e57b6d519bd

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