Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff79a455c56aacf…

MALICIOUS

PDF

79.9 KB Created: 2021-05-27 03:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1f3020179bd22abd36ba1196ffdc0ca SHA-1: ce68b53bb1cf2111805e12d0b143a5f75dc84d20 SHA-256: dff79a455c56aacf1ff61c18e3a3d38f8c79c0005d9204b396dce19bfd0e003b
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, indicating a link farm strategy, with one primary malicious URL being https://resalured.ru/strik. The PDF structure and embedded content suggest it's designed to redirect users to potentially harmful sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=word+of+the+day+toastmasters+examples
    • https://mepowisa.weebly.com/uploads/1/3/4/5/134595914/rozimu.pdf
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/3c9e84b7d80b7b.pdf
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5fd61f3d94816.pdf
    • https://kefagifugujog.weebly.com/uploads/1/3/0/8/130813645/7394653.pdf
    • https://cdn-cms.f-static.net/uploads/4408321/normal_602b2e69e3a80.pdf
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6019ca8ee37a1.pdf
    • https://nakusiwikabudu.weebly.com/uploads/1/3/4/9/134904560/jinesegijak.pdf
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe6bf0ab44f2.pdf
    • https://wagezulixi.weebly.com/uploads/1/3/2/6/132695300/d98d9.pdf
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/vivotajugazijazo.pdf
    • https://sitiguzesamow.weebly.com/uploads/1/3/4/4/134401829/subinus-luvagebut-doligibunar-werasug.pdf
    • https://cdn-cms.f-static.net/uploads/4381294/normal_605a10a3918dd.pdf
    • https://bidumijedurazi.weebly.com/uploads/1/3/1/4/131437194/6614713.pdf
    • https://duresanu.weebly.com/uploads/1/3/5/3/135334900/walibene-vevusijogasow-kajisovivoron-kevorozab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/81ef394f-18c6-491c-a450-bc30658c2b3c/badopegonigujaroji.pdf
    • https://uploads.strikinglycdn.com/files/b277ced1-f79e-4ebe-b44c-fa4678975358/brownie_girl_scout_handbook.pdf
    • https://uploads.strikinglycdn.com/files/edb04572-83d7-4f53-b907-5e0ca3615819/bujol.pdf
    • https://uploads.strikinglycdn.com/files/8588d597-98e0-4bf1-9b3d-04f0fc478256/20591279325.pdf
    • https://uploads.strikinglycdn.com/files/af5f7277-7de9-4ed1-bd96-61222bde4792/avengers_endgame_release_date_us.pdf
    • https://uploads.strikinglycdn.com/files/1489e6c9-58dc-44d7-b264-78d051443b11/6789706605.pdf
    • https://uploads.strikinglycdn.com/files/146d0d69-86b0-456f-afc8-4281c8e0d72b/zeleruzowulax.pdf
    • https://uploads.strikinglycdn.com/files/7077782a-f32b-4661-9c83-e26b89fb7d85/ldg_electronics_it-100_automatic_antenna_tuner.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f915.bin
86704c64681f45fbc69f262339a6f4b3077bbc684b46f6f953894bca4719225c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 5464 bytes
font_01_sfnt_off00010b9b.bin
1d769c7bccc2dfc35fbad4df1e897a31fbc3da18d14363d6887b838e20f5f49a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10728 bytes