Malicious PDF — malware analysis report

Static analysis result for SHA-256 99810e9d15fa1855…

MALICIOUS

PDF

71.2 KB Created: 2021-02-27 06:07:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eb227538cc78d23d4a121ca4d2ea95b2 SHA-1: 8ff3bd6e0904f041446d55ab8676820356620106 SHA-256: 99810e9d15fa18555478338fe2aa75f02011163a91f45a27f86a2bcb8fe27982
126 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'https://xajibur.ru/strik?utm_term=powershot+5700+forward+action+staple+gun', which is likely a phishing lure disguised as a product page. The PDF also functions as a link farm, with numerous external URIs, suggesting an attempt to direct users to potentially malicious sites.

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://xajibur.ru/strik?utm_term=powershot+5700+forward+action+staple+gun PDF link annotation
    • https://melugazeso.weebly.com/uploads/1/3/1/1/131164252/jifowow_fowoxubadomolu_tubakavuzetup_ravaxapa.pdfIn PDF document text
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/1e9483dd6a1eb4d.pdfIn PDF document text
    • http://watogoda.mypressonline.com/44816513103.pdfIn PDF document text
    • https://cdn.sqhk.co/pejinijew/dGciaje/hide_from_zombies_online_hile.pdfIn PDF document text
    • https://cdn.sqhk.co/dibatafuba/bgvjhdG/frndly_tv_hallmark_app.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/luvaneriluvasemesonabusox.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/ijha0o8/among_us_game_ps4_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/eR2xuPL/rarudidabebovuba.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/85afc8422e.pdfIn PDF document text
    • http://atlas-copco.su/wayne_dyer_quotes_on_peaceiekjv.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/zuziwexitajuvapev.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/fNjjjf3/samsung_level_u_headphones_manual.pdfIn PDF document text
    • http://newsportstechnology.ru/443779388062cn00.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/Sbuijgc/ripizidogijavetutot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wopari/pan_card_offline_form_sending_address.pdfIn PDF document text
    • http://zesafemumibow.myartsonline.com/how_to_use_pictochat_on_ds_lite.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/what_glands_are_involved_in_the_endocrine_system.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/livros_para_iniciantes_em_leitura.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_off0000d7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 5856 bytes
SHA-256: 44a9a40dce6706a25855729eeb7c749dcad6943de1046711182ab9535cea3a6b
font_01_sfnt_off0000ebd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD5 10412 bytes
SHA-256: bf966c49b1e7d2ff317a4cca860e581e8b9888baf3a91edaa64f5e2599ea9de7

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