Malicious PDF — malware analysis report

Static analysis result for SHA-256 d880b656d8023139…

MALICIOUS

PDF

80.7 KB Created: 2021-04-30 11:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de796b6dfe2b84d2ba7d489bad9c6940 SHA-1: 218096bbb625b100f6348db78b06d6ec6da2450e SHA-256: d880b656d8023139493b69ce527a884906a24cb00447fd0e8150cf4702844d80
224 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirection and suspicious links, including a critical finding for a PDF redirector link. The document body, though heavily obfuscated, appears to contain keywords related to sales, likely serving as a lure. The presence of numerous links to disposable hosting and suspicious domains strongly suggests a phishing or scam attempt, aiming to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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.
  • 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://dafemum.ru/strik?utm_term=toro+snow+blowers+for+sale+near+me In PDF document text
    • https://cdn.sqhk.co/susiwebuvowo/ha6gc3P/vosubumatonezajafig.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fd9f6394e23d.pdfIn PDF document text
    • http://fakaripeti.xyz/12338191166clw2s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450345/normal_6030027989ac8.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/mercruiser_3.0_engine_block_for_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5ff1d40f640d7.pdfIn PDF document text
    • http://managerprogram.live/27110501960hl36p.pdfIn PDF document text
    • http://kino-vezde.ru/badexumorufuvasunofadozuz8lgma.pdfIn PDF document text
    • https://cdn.sqhk.co/wozobifanu/QghXVhc/30998572379.pdfIn PDF document text
    • http://rarubife.mygamesonline.org/periodontologia_clinica_carranza_9_edicion.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/79422354326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_5fd665ebe7a8f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454281/normal_5ffbad2032873.pdfIn PDF document text
    • http://1yamal.space/gibbs_free_energy_calculations_worksheet_answersuqmw4.pdfIn PDF document text
    • http://pubgucbayim.com/the_sea_of_monsters_graphic_novel_read_onlineun21h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_2f2a511ac74c4d62bc398cdf2c3a67b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jagux/kirewimelivuma.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_62a457113a0340a28f06a8c40fe9f4ed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/43025154250.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/bellanca_super_viking_performance_specifications.pdfIn PDF document text
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_277eb20a91894aceba738214b80b84cd.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_off0000fd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 5096 bytes
SHA-256: f81a725e0f19f98e6c21e0c7922a752cbca8fac7b8631b941c0e05b4cad4a385
font_01_sfnt_off00010ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA0 10940 bytes
SHA-256: 7e8a92660cd7b96331ad8f9819683644b8db01c96fd6030934a3446628788749