Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4ae93312c557b2…

MALICIOUS

PDF

79.1 KB Created: 2021-03-15 02:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4f118afcdf010b6e71703892fa75b43e SHA-1: 58bbda31be6a25e4c2737cf44080582848d06302 SHA-256: 2b4ae93312c557b2e071a2a75e5c9f1cc6040006cf6ee199d2ba156cd035b904
186 Risk Score

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 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=cause+and+effect+relationship+worksheet+pdf PDF link annotation
    • https://kuvezuwuziteb.weebly.com/uploads/1/3/4/3/134388010/3519017.pdfIn PDF document text
    • http://kimujedat.mygamesonline.org/oracle_sql_developer_tutorial_free.pdfIn PDF document text
    • https://bepizapumi.weebly.com/uploads/1/3/5/3/135349865/2218215.pdfIn PDF document text
    • https://bumewotosebixab.weebly.com/uploads/1/3/5/2/135298585/31fe8f8d769.pdfIn PDF document text
    • https://kofuwirobunugob.weebly.com/uploads/1/3/4/3/134318534/mijuzasirikaj_lijipurubosiwu_dujuxusosas.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/e124f275b.pdfIn PDF document text
    • http://natorg.fun/41659960476q666i.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/79307538237.pdfIn PDF document text
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/turipigobuf-xedek.pdfIn PDF document text
    • http://crawlmqyu.space/historia_de_estados_unidos_thomas_benderkmdp5.pdfIn PDF document text
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/d3d91b43b5fd.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/holmes_and_rahe_stress_scale_calculator.pdfIn PDF document text
    • https://relowuforobelo.weebly.com/uploads/1/3/4/5/134528439/tokezo.pdfIn PDF document text
    • http://creditpm.com/kadiniloi9kel.pdfIn PDF document text
    • http://nefutekugurenap.mygamesonline.org/sejelusivad.pdfIn PDF document text
    • http://mujododaziwato.scienceontheweb.net/30628763300.pdfIn PDF document text
    • https://palalolak.weebly.com/uploads/1/3/4/4/134443088/4fdcdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/is_tesla_model_y_bigger_than_model_3.pdfIn PDF document text
    • http://lugukejuraxa.rf.gd/kakapojetuxipugaja.pdfIn PDF document text
    • http://puvapulugo.onlinewebshop.net/foxowaxiwamejivabizeg.pdfIn PDF document text
    • http://zukanimi.epizy.com/getuvazilimujugapasatotow.pdfIn PDF document text
    • http://fonufusova.rf.gd/easy_flowchart_maker_online_free.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/37108670704.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_off0000f7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B5 5304 bytes
SHA-256: 5d4f58c8bdf6d6400c1c08cb8d22f589964a7c4e4bdf1d41de488cb16edb6013
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 10876 bytes
SHA-256: a375abdcf508cef853a8ab1e952a801b27333ea17a273ecbc4d892f5ec4aabcd

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