Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c889454901f943…

MALICIOUS

PDF

97.4 KB Created: 2021-06-04 21:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c0599de30bc3b8bb711ca62b1356a994 SHA-1: 42754779940d0d6d42e95c5e6b495f6777f888e0 SHA-256: c1c889454901f9431d6fff22a6e72f186b9a46b0127b404733b6ea0ffadd4a58
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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://dafemum.ru/123?utm_term=android+developer+jobs+in+egypt PDF link annotation
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/6397883.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470540/normal_60b05189ea514.pdfIn PDF document text
    • https://wexixumativedo.weebly.com/uploads/1/3/4/8/134865676/7151586.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/8148810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450728/normal_60313457541b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_60179027b3fe7.pdfIn PDF document text
    • https://sizuginoten.weebly.com/uploads/1/3/4/4/134490660/9c679.pdfIn PDF document text
    • https://pokakananame.weebly.com/uploads/1/3/4/4/134457622/kefakagukenorur.pdfIn PDF document text
    • https://bulakivu.weebly.com/uploads/1/3/4/8/134877285/2243213.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490263/normal_602feaea9337f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5fe466e2eb944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_601bad025558e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_6033fd816dea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_602159a6ad151.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464327/normal_6034f9398d43e.pdfIn PDF document text
    • https://zivadufo.weebly.com/uploads/1/3/0/8/130874541/3609430.pdfIn PDF document text
    • https://naletonuve.weebly.com/uploads/1/3/4/3/134381452/zuvuforerajodivug.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/5583b046-c8b0-4b83-adaa-a604ff51ef96/40427508685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a08905f-3ba8-4a78-a185-3386d42c341d/jemopatirutigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61df7a2b-b86e-4b7f-b2c4-756576dc1b4d/feluruvazetoxekexibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4548affb-a42e-49d6-9794-bc95df1d614a/dna_replication_worksheet_answers_chapter_17-2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfd654d-5754-45c5-a8ff-2539221d3bf0/45822407544.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 5072 bytes
SHA-256: daad4d7f7a6cf05b0f614b4879a250d09df432791401423a8ac661dcee109586
font_01_sfnt_off00012117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12117 2836 bytes
SHA-256: 5d79c3cfa761239cb623c50b33702f89a7bcd154cef0b64f428e2100932ed45b
font_02_sfnt_off00012d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D22 10916 bytes
SHA-256: 7f4c29d2ab2484eb3296cde61913dbcdf313dfdc56cb9e071dd1d9a54ea74e8a
font_03_sfnt_off0001521e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1521E 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_04_sfnt_off0001674c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2