Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07b1dd91eb60deb…

MALICIOUS

PDF

81.1 KB Created: 2021-03-30 19:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 46c081d1b6d48edfd4832a8ad896922b SHA-1: c5592c5dfb52b5a036da944898e08bdb903696c9 SHA-256: a07b1dd91eb60deb356301913d64d63ea0487123735305ad97fc62961334fab4
244 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs pointing to potentially malicious sites, including a known redirector. The primary purpose appears to be directing users to external, potentially harmful content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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.
  • 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://crophysi.ru/wix?keyword=diamond+synergy+forskolin In PDF document text
    • http://pay-order.info/rozifafexutorawoz4k3do.pdfIn PDF document text
    • http://zanartcc.net/beowulf_full_movie_720ph3gii.pdfIn PDF document text
    • https://danupinizagene.weebly.com/uploads/1/3/1/4/131483344/fitonilog_milewimija_wototavedixutik_zurusupij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415783/normal_5fe2a1bba1371.pdfIn PDF document text
    • http://flebolog24.com/53557881679yp9p6.pdfIn PDF document text
    • https://womevelem.weebly.com/uploads/1/3/2/8/132814223/nasalufelipewukas.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424982/normal_5fc95e143648d.pdfIn PDF document text
    • http://agencymedia-ig.com/is_microsoft_project_included_in_office_365_business_standardy9l4t.pdfIn PDF document text
    • http://help-bluebadgecenter.com/369233206763e461.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_5fec5b30609a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420025/normal_601b4962272ee.pdfIn PDF document text
    • https://tofesozexeraj.weebly.com/uploads/1/3/4/6/134610570/kamon_sudidelamamega_fulaxige.pdfIn PDF document text
    • https://lobixeximoruse.weebly.com/uploads/1/3/5/3/135319822/baxufavilowuletuduj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c93c19b4-056e-449f-9224-d07bd9c1c22b/fofolite.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/classzone_math_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/kogagikovobobesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974e3fd4-496f-4d4a-bd04-216e2f608162/how_to_explain_too_to_a_child.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97087bc-27bd-4632-b2f2-915b09f0fc10/78861421993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b56e7218-58d0-4b3b-96d7-686290af23bd/favoxisavibukoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dc81d5-25db-4494-93d4-1f70d1909a83/subemabebagedasutitaziw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5708fd72-cf94-49ff-af50-380317cc1d35/34453659711.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/65800570641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/934afa4b-2b6a-469d-ac52-47dc8ebfbbf7/39413003545.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 5100 bytes
SHA-256: 04debabf9c05b55f811f8148e16c2d395beb213e7fa4d5277013386edbd9f269
font_01_sfnt_off000101a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A9 11456 bytes
SHA-256: a5dddc92c2fc781d25ed9d04bbed07d8181dea246e6391605796b4d29c415a03
font_02_sfnt_off000128bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3