Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c69eb4dfc65c59…

MALICIOUS

PDF

79.7 KB Created: 2021-01-12 21:53:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 62efbce42ecfb9e507f9db5ecd428311 SHA-1: 117b47fd4071d0d06dac3fa385c51f4696e0f738 SHA-256: b5c69eb4dfc65c595de5a4af9d62b9570b0ea8de0504fe3878fb5d877a7db5df
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to other PDFs, suggesting a link farm or SEO scam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a trojan. The presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the document's purpose is to trick the user into navigating to a malicious URL to download further content.

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.
  • 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
  • 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://trafffe.ru/123?utm_term=life+recovery+bible PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466173/normal_5fe2404ff2fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_5fd6e1a387830.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494868/normal_5ff02f4a669e5.pdfIn PDF document text
    • https://fibobamoga.weebly.com/uploads/1/3/1/6/131607866/dd4e724049d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5fc9c354a523b.pdfIn PDF document text
    • https://bivilasafufi.weebly.com/uploads/1/3/4/6/134689398/07a452d1df128.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412895/normal_5ff5f30c84702.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/5628448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5fc93cf0b4b19.pdfIn PDF document text
    • https://jufapagemegugux.weebly.com/uploads/1/3/4/8/134860181/mojal.pdfIn PDF document text
    • https://kelodulelonax.weebly.com/uploads/1/3/4/6/134644310/xunotijonux_xezugadinabanub_fafuzi.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/kisilewufufixu_wividususivot_mimaruniwi.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/xuxifuzituwu/tinoxesifitezuzoz.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/dumuzuxezoz.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/how_to_be_a_conversationalist.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_off0000f252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF252 4728 bytes
SHA-256: a7d7c90370cc8a8f1adc355c86c019c117a25957993eb64fa744db993d940f03
font_01_sfnt_off00010286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10286 2284 bytes
SHA-256: d64340b15287c056ecc73f7633c35ed589b75f78d9041c43f06e2711d127cdd4
font_02_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 10728 bytes
SHA-256: 1de72d557e57d1858202e2c35c9e0e7dd335a7be27985286901c936288d251f3

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