Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7087af41accfa47…

MALICIOUS

PDF

73.0 KB Created: 2020-12-19 11:20:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0e9ee8e86a8102f8a13d2a52f3a193f SHA-1: bda9ccb75f1cf8597ac2b03ca5e3d707ffc15541 SHA-256: e7087af41accfa472f2a97b2bfe9b0514ea1f1eb11516997a76e9375a4d9c78a
222 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external links, including to S3 buckets, suggests an attempt to obscure the final malicious destination or engage in link farming, potentially for SEO manipulation to distribute phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/aws?utm_term=open+vs+closed+syllable+worksheets
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5f97caf260ed2.pdf
    • https://cdn-cms.f-static.net/uploads/4414687/normal_5fa519f67e8d6.pdf
    • https://cdn-cms.f-static.net/uploads/4380413/normal_5fa34c1f5387e.pdf
    • https://somisesi.weebly.com/uploads/1/3/4/5/134523690/88d39ec50da1d.pdf
    • https://cdn-cms.f-static.net/uploads/4427097/normal_5f9915a23b170.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/wufujudisu/68103369448.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/nozufojumulowizu.pdf
    • https://s3.amazonaws.com/dinisemowoge/dumurefuferag.pdf
    • https://s3.amazonaws.com/dinilederu/aladdin_friend_like_me_sheet_music.pdf
    • https://s3.amazonaws.com/kodipopujufipig/apache_http_server_for_windows.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b8.bin
ec2685a438322d366ae75129315c4e1c3d22b2282402bc329d4da34472c8e81f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 5388 bytes
font_01_sfnt_off0000e312.bin
215e8bb53fca7232027d178e77190196358dfb819b0df8848ce7c2b7e3fbaa91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 11060 bytes
font_02_sfnt_off000108ab.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 4324 bytes

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