Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c33ba6b0a66c86…

MALICIOUS

PDF

80.5 KB Created: 2021-05-12 17:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4223a3cb56b564131e7ef0bdaaeafc37 SHA-1: 478c7c070d605c189085ea45d610911c17e3f65b SHA-256: 41c33ba6b0a66c86a1ed3531587c53bde9890f2080f7624cd62b6ac22ac2e54f
186 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 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=the+secret+life+of+walter+mitty+synopsis PDF link annotation
    • https://piramejujidizek.weebly.com/uploads/1/3/4/6/134694247/tudakaja-goruve-nupake.pdfIn PDF document text
    • https://mixezefu.weebly.com/uploads/1/3/0/8/130874535/147f4e.pdfIn PDF document text
    • https://werirubiteda.weebly.com/uploads/1/3/5/9/135972418/wuwavobovonajir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5ff4d74fbfc4d.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/83d13cde.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/ijaiaji/fixudemij.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/salamewalupub-vudujojabose-tidiwe-regukogedofajen.pdfIn PDF document text
    • https://cdn.sqhk.co/tutadazi/diiva0c/biology_karyotype_worksheet.pdfIn PDF document text
    • https://genifefesabido.weebly.com/uploads/1/3/3/9/133999330/1956371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ff9347374f3f.pdfIn PDF document text
    • https://fogodaxo.weebly.com/uploads/1/3/4/6/134606017/latobadisukepa_tezogijod_rijotowiwik.pdfIn PDF document text
    • https://cdn.sqhk.co/zabeluzitema/FOhecl7/pofapifomufezilobibenitu.pdfIn PDF document text
    • http://am-sound.ru/tofoposejitetomilesujanop0cbh0.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/iIggu2a/16256902998.pdfIn PDF document text
    • https://tadesurirow.weebly.com/uploads/1/3/2/7/132711952/wuxusemefib.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/how_to_be_a_competent_leadertxzl5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_601a3463967c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502236/normal_6053410c9c2d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a193299f-8ddd-4d0b-b4da-7fd76ff5cc44/16877130848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69c8c0fd-5c82-4571-8d8a-d068aa133bea/dunkin_donuts_stockbridge_ma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c5be87-23d5-4a46-831d-25df1d4a96b9/fipozikemugem.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_off0000fcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB6 5396 bytes
SHA-256: c6e471cb5368d8a410d0faf1fb6b40182db5005f3e088f4160920ba1098082e8
font_01_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 10640 bytes
SHA-256: 347493a3667ce51bcb30c239c7614a2885080d0e2c52d7137059981addd2e5c4

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