Malicious PDF — malware analysis report

Static analysis result for SHA-256 e399f9985f17d7d1…

MALICIOUS

PDF

76.6 KB Created: 2021-04-05 00:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 995c1c45573c6492453c37518ac976c0 SHA-1: afb330e1448aa73c4ab51f26d2c1b74e89e0c4b8 SHA-256: e399f9985f17d7d19fc34c529fdd84072f5661d5c801ad958d2af3b2ffedea37
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to PDF size reduction, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/award?keyword=adobe+acrobat+reader+dc+reduce+pdf+size PDF link annotation
    • https://neverazu.weebly.com/uploads/1/3/4/9/134901342/9efd3.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/punerebup-fanijol.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/8948145.pdfIn PDF document text
    • https://siganubamisibu.weebly.com/uploads/1/3/4/1/134108806/4517106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460066/normal_5ff337cfa94ec.pdfIn PDF document text
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/barapefetanepekizev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458163/normal_5fdc74a414ada.pdfIn PDF document text
    • https://dilukali.weebly.com/uploads/1/3/4/5/134584555/0ffb07f.pdfIn PDF document text
    • https://nogigeto.weebly.com/uploads/1/3/4/6/134665346/wasipo.pdfIn PDF document text
    • https://pirodiditabun.weebly.com/uploads/1/3/0/9/130969169/6699544.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/zijivevip/23958101555.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/detudetomaripalefiginijo.pdfIn PDF document text
    • https://6648aa49-deb3-4d6f-81a8-a63cc7a297fb.filesusr.com/ugd/38eac1_6674f8175b8445f48a3b45974302de87.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/is_deskjet_2132_wireless.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/information_technology_examples_at_home.pdfIn PDF document text
    • https://198d5876-2e36-4a54-a59d-b4c1060b65be.filesusr.com/ugd/4733ca_8555e0b5cb2447c5926bc5da1d439f18.pdf?index=trueIn PDF document text
    • https://a49ec80b-b4e3-4dac-84ed-d687b6aff6a5.filesusr.com/ugd/46d696_705f6326a1c5447e8811929a3961b1e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gedexim/93162158837.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/3707811776.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/62835941798.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_off0000edc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC0 5296 bytes
SHA-256: a6dd3ae51357da5cc9bb7511852e2d7c691eb82f0279b225e99553198f574ef2
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10504 bytes
SHA-256: eae48e89bef5c57368717d181f69388f40804190231814840d122a2e3c6bb97b

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