Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d387a828cf11ab7…

MALICIOUS

PDF

74.1 KB Created: 2021-03-20 14:42:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b4b88d703690f012e009c8692b025338 SHA-1: b0f0744a8edbe9a540f7d9860bdb1ecf9e9dfca4 SHA-256: 7d387a828cf11ab7d92d45fbed429daaadea6d8577040ddc6dd7f8ca9e5ed026
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The presence of a redirector URL and the ML classifier's high confidence score indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/strik?utm_term=how+to+calculate+the+bond+order+of+nitrogen PDF link annotation
    • https://siwusoxol.weebly.com/uploads/1/3/4/5/134584737/kelaziworifuvuxun.pdfIn PDF document text
    • https://defavelusanopef.weebly.com/uploads/1/3/5/3/135345674/cd44306f9.pdfIn PDF document text
    • https://polatubogo.weebly.com/uploads/1/3/4/5/134598163/nudojimobipux.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/voraserur_mexegenavipem.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/8388866.pdfIn PDF document text
    • https://xigobiniliw.weebly.com/uploads/1/3/5/2/135298108/36f6adfdcdfe.pdfIn PDF document text
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/8104676.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/973cda3cb7.pdfIn PDF document text
    • http://tewezivigu.22web.org/zutenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tometubufimopim/xofuf.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_af5f4f890fab4c2c8c4df2d9ee60a8fd.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_0788019877ae4d1c9f34fcb0c2753d6a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/95631575083.pdfIn PDF document text
    • http://zetakid.rf.gd/stream_movies_online_free.pdfIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_eda33ea284a542f7b47fe87f847e4b91.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/tudute.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/flyer_photoshop_templates.pdfIn PDF document text
    • http://zugujegezamuto.epizy.com/limegovobixotumotajo.pdfIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/beelzebub_episode_32_sub_indo.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_off0000e0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 5300 bytes
SHA-256: 47799391b2bd297126c7cef54c431cfef9c02caa8cb3d3414d47fd6e587b071e
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 12084 bytes
SHA-256: bc26beeab5259cd2aea4096ab9bd1facf435bef54166b1296550f23fa9c2b5d6

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