Malicious PDF — malware analysis report

Static analysis result for SHA-256 2304e8018602e0e8…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 08:13:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cd01bd507f2270b45f8e781636b6cdf8 SHA-1: 92f816d73a46661c388d53d21f961fd0fc68a62b SHA-256: 2304e8018602e0e8d369e687d0b40f4c26cfa4f40eb5c3033d8cedcee9965a67
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results for technical documents. The primary malicious URL identified is dugedepap.ru, which likely hosts a phishing page or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://dugedepap.ru/wix?keyword=engineering+fundamentals+an+introduction+to+engineering+si+edition+pdf PDF link annotation
    • https://tupedofezelazib.weebly.com/uploads/1/3/4/3/134368784/fudeti-tizaxom-zuwawutobisorar-kotufesofo.pdfIn PDF document text
    • https://tebiwexarug.weebly.com/uploads/1/3/1/3/131380746/vuxesojesexuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412889/normal_5ffa893cd9fc6.pdfIn PDF document text
    • https://danaguvofuboxi.weebly.com/uploads/1/3/5/4/135401293/34501ab.pdfIn PDF document text
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/jimobanikisuxurowu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421943/normal_600a031939d7e.pdfIn PDF document text
    • https://zosujugopaw.weebly.com/uploads/1/3/4/5/134509911/67b39a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_601cc3186b473.pdfIn PDF document text
    • https://dixatuwep.weebly.com/uploads/1/3/5/3/135398053/bavozikivuzex_figomakesenuj_revag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_6037e5ff76b41.pdfIn PDF document text
    • https://gisoroweri.weebly.com/uploads/1/3/4/8/134893792/43b7dd2462d99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6046c58dd653c.pdfIn PDF document text
    • https://nagaxubonafebax.weebly.com/uploads/1/3/1/6/131606673/5643518.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_07a31a14bc1f4a61b5096a78aa55dcbf.pdf?index=trueIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_dd5ebd275f7f4857ba6e9624e6aae4d7.pdf?index=trueIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_f7fb7831332e4b5a977d44917b5fbf14.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/why_diesel_engine_is_noisy_in_operation.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/atmega328_microcontroller_pin_description.pdfIn PDF document text
    • https://034618a9-9b39-4f41-ad18-95bca1d1c80b.filesusr.com/ugd/48d9a1_01696a390ad445ac93c93fa0ed6917be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sinadi/que_significa_titulo_azul_en_mxico.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/fapirazezizidipezajakopo.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/mazixetegep.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/14132756863.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/zilotapezipoganevalo.pdfIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_df1731cb0b7143e2ad2562a0103ddc25.pdf?index=trueIn 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_off0000e84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84B 5432 bytes
SHA-256: b9e0f456e04e7d8f63956b273940de9fc6c4c3712685bac9a919f712357c1c86
font_01_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 10644 bytes
SHA-256: bbb2db1f20de60558f7e09879b0265682d239e94abfd1bf99168cd6984213535

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