Malicious PDF — malware analysis report

Static analysis result for SHA-256 2625f57bd15f78b6…

MALICIOUS

PDF

73.4 KB Created: 2021-06-10 09:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bcb0a78793e1dc77fd748741f5b09f0b SHA-1: dc0827f4ac018292a61930c34c55d6d373b4d89a SHA-256: 2625f57bd15f78b66fa5a1f21e9dba573eb7c28f9635d453444109ed287de1d3
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution through these linked PDFs. No scripts were extracted, but the structure suggests an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/pbw?utm_term=mix+tenses+exercises+with+answers+pdf PDF link annotation
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/migod_pulegubejizawal_sexekujer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_60586fc598cfa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484812/normal_600ca172cc4c0.pdfIn PDF document text
    • https://ranuxibat.weebly.com/uploads/1/3/4/5/134595997/7689971.pdfIn PDF document text
    • https://fevanigazotife.weebly.com/uploads/1/3/4/3/134376534/d9b7f4c1cb45ce7.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/5f1477f41797e0d.pdfIn PDF document text
    • https://bekonerotukabi.weebly.com/uploads/1/3/4/3/134366377/vajofagaboz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_605390afac693.pdfIn PDF document text
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/4476502.pdfIn PDF document text
    • https://bixunirejo.weebly.com/uploads/1/3/5/3/135329058/jinaruguve.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459470/normal_5fe13c4e15891.pdfIn PDF document text
    • https://pafediroloz.weebly.com/uploads/1/3/1/3/131379748/6bbb2.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/mudipipokeroburudafu.pdfIn PDF document text
    • https://suvedezu.weebly.com/uploads/1/3/1/3/131379937/nowotifaligixupejeni.pdfIn PDF document text
    • https://sewolisexuvafu.weebly.com/uploads/1/3/2/8/132815731/ligasato_gusob_gipoxesapovajov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd269c2ce4ac.pdfIn PDF document text
    • https://xigukiburid.weebly.com/uploads/1/3/2/7/132741693/d1e3c0ad5.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/wimeberilolomeg_lokuto_mivurijixijite.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/49812854-d8b2-47fa-9960-0294eac87ed1/what_is_the_correct_tension_for_a_singer_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b972cf91-5894-4fac-9ed2-092d2d2e83f4/what_is_stanza_in_a_poem_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9ff16f-9fa4-4a08-9346-c90ed4193eb0/retazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d44d1c-c243-4063-9e6a-0a9f3e955821/nikon_prostaff_rimfire_ii_3-9x40_bdc150_ebay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6d06304-f590-4eb8-97b3-82feafab6015/excel_formulas_if_then_color_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12cf43bc-db42-44e1-9595-e966f5855d9b/acordes_para_piano_alabanzas_cristianas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a498a120-66c0-44cf-8d55-21aae83a4fa8/gulirevutixanizamofatarix.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 5376 bytes
SHA-256: 2bd6584739ac3c0c7314c5a68fe18f74b91a3a909736ecdc080bff00258731e2
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 9964 bytes
SHA-256: a54fe93b90d513c956190a82933c38230f2f4852b033619ecfc9b1b7ebda4857

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