Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6956266f4641ded…

MALICIOUS

PDF

83.0 KB Created: 2021-02-13 14:29:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: dd5c6525520dc40d8f068e8145004a8c SHA-1: 8423915ef81afe6832f28913890c5b40a5864b5c SHA-256: b6956266f4641deda28e8cb67979ba1b6dece63a2b2da96cd64f08ad9a6aa9eb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=clash+of+clan+excel PDF link annotation
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/87aaadd5851ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fdfc30a1ab52.pdfIn PDF document text
    • https://tagudosalanuku.weebly.com/uploads/1/3/1/4/131452811/41a37d6d3.pdfIn PDF document text
    • http://tehnopolis.org/51098650312cnmf5.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/dbe5a9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5ffb8334e47ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408865/normal_6022e1d417fda.pdfIn PDF document text
    • https://forilulan.weebly.com/uploads/1/3/1/4/131408022/2ad0ee.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/hcic9gh/80s_karaoke_songs_with_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_6022a159141de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492275/normal_5ff36e184ee49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fdf6bfbbbae0.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/wetevali/48382328711.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/nazapinajesak.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/alanis_morissette_albums.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/binodini_dasi_autobiography.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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 7356 bytes
SHA-256: 04ff9468ee101467ca5ffa426db80160cd4803b15c888d27dcdf5da3ce95f7de
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 4848 bytes
SHA-256: 9dbb8bfb17eb1bc18f1164b223faeefeb38bc1704c21296149af013e3237f126
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 11216 bytes
SHA-256: 4b2da811f4ba4abcfc875e7c492616f3cce1894a8e7781e30355feb0d6c59f7c

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