Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da627e9e1f9edaa…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 13:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 9deaa8f09cb9531c17fe344ced2fc27e SHA-1: f9c90a95cededaadd0fcbb63a6ede264ab9f62ee SHA-256: 1da627e9e1f9edaaa7c1b48ae7e0450e1c128a9d451e30a0804560583172d754
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One embedded URL, 'https://nipisod.ru/wix?keyword=christian+services+online', and another linked PDF, 'http://navevukosuso.mypressonline.com/pavelikinokogo.pdf', are suspicious. The document body is heavily obfuscated and appears to contain metadata related to its creation by wkhtmltopdf, rather than user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/wix?keyword=christian+services+online PDF link annotation
    • http://navevukosuso.mypressonline.com/pavelikinokogo.pdfIn PDF document text
    • http://zonuvak.medianewsonline.com/folojodirezebosijudib.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/vemilik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_7464fcf30c154ce5b0e41e52e7df9193.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/sajibazojilex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdd8929-d996-4f5a-b7b8-af87e2956d57/how_to_stop_parental_alienation_in_texas.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_5307fc7d739a44209edad9f3ea023f4f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b755315d-17d5-493a-87f4-4cb7d575adfb/taotao_50cc_scooter_ignition_wiring_diagram.pdfIn PDF document text
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_d2dc35b50eb742cabe8c66920232a473.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e09bda63467e4f54a97dd362d781af31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6caa5ac5-d3bf-4e7f-acaf-9c7bfd5cb3eb/how_to_protect_yourself_legally_as_a_nurse.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/puzanitivolodudipijefe.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/nibajupewof.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_bcb190887a4647a59a145ad5b1142b30.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8ea9104-249a-43b1-be63-3c6e018e9ba2/73210021532.pdfIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_82cb0bf9d3254d3eb3cb46796c45e1ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d9ba94f-23b9-4596-9ea1-929e18b7f169/polanyi_m._1958_personal_knowledge.pdfIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_640e2261e11a40e08f97506e788333cc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3885544a-5d92-4167-ac69-6aa86299c589/bokepoto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45237a32-4e58-40d0-bb15-972f8e29080b/jofajuwepelizidu.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/26015456567.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_90097d41a5f040319355fb2477fa85f8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6491d4b-a99f-40dd-be29-5391dc813466/el_reino_de_este_mundo_resumen_del_capitulo_1.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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 4852 bytes
SHA-256: 1053eaacbad0195c1105366754c6889722cb13b8ebdf762733359253b2f36ca1
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 10172 bytes
SHA-256: 9422f975ce61ae4c36f8bab60175affcbcb68f2a23b53b45443901f124776a92