Malicious PDF — malware analysis report

Static analysis result for SHA-256 5662c877be032be9…

MALICIOUS

PDF

95.7 KB Created: 2021-04-01 21:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bd31f69d90749647d3cec85050b18b94 SHA-1: 6fb854ba5708a7c1e451e2e0c5ff4f7987c788af SHA-256: 5662c877be032be95f773c40920933b8d4c2877ede4b90594bf3ef49c4d6d1cf
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is described as a link farm. The presence of external URIs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=experimentos+con+animales+y+seres+humanos PDF link annotation
    • http://wotedogupowu.sportsontheweb.net/247310609.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496824/normal_601c75041135a.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/vawiguko.pdfIn PDF document text
    • http://vatamuvemazaril.sportsontheweb.net/wixarodilotuvuj.pdfIn PDF document text
    • http://sovetnik53.ru/el_pas_de_las_sombras_largas_libro_completo5nwyn.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/awash_bank_profile.pdfIn PDF document text
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/sazopejo-xakig-fuwikemotig-dowakuwiduwijam.pdfIn PDF document text
    • http://erogan-columbia.site/how_to_crack_sentry_1250_safep3991.pdfIn PDF document text
    • http://fomoregekamikat.mypressonline.com/anaphylaxis_action_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_6044ff4446e2f.pdfIn PDF document text
    • http://dalnoboyi.xyz/lezojeguvutejalutuc62dj.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/pobumepaxagiju.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/dosakukosumipo.pdfIn PDF document text
    • https://zoxuxidez.weebly.com/uploads/1/3/0/7/130775284/lubiwufi_ropalo_tudem.pdfIn PDF document text
    • http://kirudikegopoded.sportsontheweb.net/vewamapojivefiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_6046b61cbd08b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd7ab9fabab6.pdfIn PDF document text
    • http://felesatediz.medianewsonline.com/circular_motion_physics_12_notes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_605c067293647.pdfIn PDF document text
    • http://usacarins.com/ipega_controller_ios_setupwp7y1.pdfIn PDF document text
    • https://lanapovo.weebly.com/uploads/1/3/1/4/131437145/7446830.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/graco_contender_65_convertible_car_seat_rear_facing_height_limit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujumek.myartsonline.com/print_webpage_to_ipad.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 5300 bytes
SHA-256: fca737e301254e058e7a16bbbd5d6a0cc194fbf065bc2159918c6cb8a0fadd3f
font_01_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 14308 bytes
SHA-256: cc4dcfcd1d2d680d198eb4d439475c8c6f291db75c75c4f496f4433c4485563b
font_02_sfnt_off000159f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F5 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd