Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff7055bd61c7436…

MALICIOUS

PDF

84.7 KB Created: 2021-05-26 06:19:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0c37b2599a6808e1e4a07bef5891c094 SHA-1: ec1a168eba221123aa9358c7ec3fbc2d6f01f3f3 SHA-256: 3ff7055bd61c7436f37c972dd20519879b2c9a94da75fafab67ab8b1dd3a1be1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains and S3 buckets. One of the primary external URIs, https://golowaki.ru/strik?utm_term=io+e+te+niccol%25C3%25B2+ammaniti+pdf, is flagged as suspicious. ClamAV also detected the file as Pdf.Phishing.Trojan. The presence of numerous links suggests an attempt to manipulate search engine results or distribute malicious content, aligning with a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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://golowaki.ru/strik?utm_term=io+e+te+niccol%25C3%25B2+ammaniti+pdf PDF link annotation
    • https://wapexuji.weebly.com/uploads/1/3/5/3/135329723/ligarosakexenam-rifuf-lukezoninew.pdfIn PDF document text
    • https://kerutefabiwemek.weebly.com/uploads/1/3/0/8/130874269/172463.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425217/normal_5fec9faedffff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_6048a0b73ef8c.pdfIn PDF document text
    • https://xufibafit.weebly.com/uploads/1/3/4/4/134403857/muzisikir.pdfIn PDF document text
    • https://koludoselutak.weebly.com/uploads/1/3/4/8/134893798/lokuxejunigasof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418170/normal_5fdfd8e6e37ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_602c324d946eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_60530871e0e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_601f56d654356.pdfIn PDF document text
    • https://jedifubebevaze.weebly.com/uploads/1/3/4/8/134873515/245591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468261/normal_600eff1e4a2ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488137/normal_6005a0c89da02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_604b576604927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_60233401abd75.pdfIn PDF document text
    • https://litepuvib.weebly.com/uploads/1/3/4/7/134741427/aae24f.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://s3.amazonaws.com/ponivotigegepub/xakifojibipafifi.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/76685365125.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/segudugujax.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/guvavulo.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/keurig_hot_2.0_k525c_plus_series.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/muvelumidulisosesonukigef.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/fegamovanorotusob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001017e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017E 4888 bytes
SHA-256: 81df7f338892ceb8fc644f58bc9b9ea22fa0b419bede210a3fb15948a4125567
font_01_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 11592 bytes
SHA-256: b50dc9aae18b4d45d55a23dea1b4e2c80bc8d40bd2bea78152875a055905a864
font_02_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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