Malicious PDF — malware analysis report

Static analysis result for SHA-256 17877a5843f88dca…

MALICIOUS

PDF

80.7 KB Created: 2021-02-21 05:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 60037af5b5f732eb15b903d639577c6e SHA-1: ce07be502f10ed64a62abde85b4100926abdcdd1 SHA-256: 17877a5843f88dca278d285d68aecd93e15ceb833e239fc20997f3eedf752309
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm' designed to direct users to numerous other PDF files. The primary external URL points to a domain associated with spam or phishing, suggesting the document's purpose is to redirect users to potentially harmful content. No scripts were extracted, but the structure and heuristics strongly suggest a phishing or spamming campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=where+to+buy+replacement+parts+for+keurig PDF link annotation
    • https://bewapuvin.weebly.com/uploads/1/3/1/4/131453684/mufidusugosike.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/93beae139a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffb3055f1b43.pdfIn PDF document text
    • https://cdn.sqhk.co/wejupexuput/hhehhVU/mimpi_mendapatkan_anak_laki_laki.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/YoD2nhg/werewolves_haven_rising_apk_full.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/pagas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_60106203201d6.pdfIn PDF document text
    • http://abwaab.su/measure_of_each_exterior_angle_of_a_regular_polygon_with_24_sideskigzb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454545/normal_601730cdf0289.pdfIn PDF document text
    • https://wevenakexeg.weebly.com/uploads/1/3/1/4/131438808/4efc6d.pdfIn PDF document text
    • https://divojalu.weebly.com/uploads/1/3/4/6/134664609/wozudedinev_duboduvut.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/bejexe/allah_ke_bande_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/kaxejujasunixavaxexe.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/mezowudunu.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/tally_balance_sheet_format_in_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/blow_molding_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/offline_website_er_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wewiro/list_of_latex_mathematical_symbols.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_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 5748 bytes
SHA-256: 0854941be0988602d72da8240be48145d26a314b5c55b75117275930b64fd744
font_01_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 10752 bytes
SHA-256: ed745c7fdbd8c347159b6ff68c0493c97e638d45fad1457354b6464639718edd

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