Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bc4b36f8f8d0c3…

MALICIOUS

PDF

76.1 KB Created: 2021-05-30 22:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 27f22dba19a117b27c6097c38d4a4cac SHA-1: 07ffb19544be477cf83112cb498d146251884a25 SHA-256: d9bc4b36f8f8d0c3ad158a1805ce4425b78d656b3a85a7c29283832a6adf44c3
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one prominent URL pointing to a suspicious domain that is flagged as a link farm. ClamAV detection and ML classification strongly indicate malicious intent, specifically identified as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to Google Sheets, which is likely a pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=how+to+make+a+log+graph+in+google+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427313/normal_602953db5c130.pdfIn PDF document text
    • https://dikodaselafilug.weebly.com/uploads/1/3/4/1/134108642/fodedirul.pdfIn PDF document text
    • https://rixonusoraj.weebly.com/uploads/1/3/0/7/130738646/1903cba9f3b746.pdfIn PDF document text
    • https://sodolujakuxef.weebly.com/uploads/1/3/1/3/131398606/fapujivofep_xajid_fugexi.pdfIn PDF document text
    • https://dunewalowipeli.weebly.com/uploads/1/3/1/8/131856746/tawiwofus.pdfIn PDF document text
    • https://nufodovepitad.weebly.com/uploads/1/3/4/7/134718778/316f597a71f2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451757/normal_60067fbbed6a4.pdfIn PDF document text
    • https://budasanufewe.weebly.com/uploads/1/3/5/3/135323580/pivezexugomal_rojinidifa_vusizaloxaja.pdfIn PDF document text
    • https://duzebovad.weebly.com/uploads/1/3/4/3/134316699/7838123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_603cf0fba3842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60624aafe85a6.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/ed2cb97b-c8ea-4e23-a098-6a1196eb9977/nuduzemufurorekoba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de35dbe-991d-4193-9b68-417232fd266b/kisob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9dde95f-d5a4-4bd8-abb0-14bf83d40359/will_there_ever_be_another_twilight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b7d4e5-cdb8-4ef6-a4e7-025adb6e1fb8/45420153000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea93d8f2-d9c8-4deb-866a-645f617d4181/52556265717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e432613d-8596-425f-8de0-c9f480ec073c/77487515505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea997bd-bfa6-494f-a376-edac86dbae6e/el_nombre_de_jesus_hay_poder_letra.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_off0000ecbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 5352 bytes
SHA-256: 462bf2acdb403aea32beb1869a3700d70793f24ad9d026b05e392b2617416e92
font_01_sfnt_off0000fecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECF 10736 bytes
SHA-256: 35ba699d482975aa24926ca035832221928bc403c77f21edd76dfe93c5e851d8

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