Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58b99d8a0614c73…

MALICIOUS

PDF

71.0 KB Created: 2021-02-23 08:41:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bf7ee677b4ffa7aa75bfdc9dcef346ae SHA-1: 2c451f2ab62017987d258d4bec2bdd10a5330859 SHA-256: a58b99d8a0614c73045942b0cc0c226ae0d663942487c3cba2ae43f1a2616137
244 Risk Score

Malware Insights

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

This PDF was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm on disposable hosting. The ML classifier also strongly indicated maliciousness. The embedded URLs likely serve as lures to phishing sites or further malicious content, consistent with a spearphishing attachment attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+to+set+time+on+orbit+sprinkler+timer In PDF document text
    • https://rosotomana.weebly.com/uploads/1/3/4/5/134585450/6558431.pdfIn PDF document text
    • https://fumadutukit.weebly.com/uploads/1/3/1/4/131437402/3451132.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/kijhgfb/simplest_checklist_check_checklist_checklist.pdfIn PDF document text
    • https://wawupibinotab.weebly.com/uploads/1/3/4/9/134900246/948c3824.pdfIn PDF document text
    • https://vinaxana.weebly.com/uploads/1/3/4/7/134725794/daposarasomorokapizo.pdfIn PDF document text
    • https://dezirivudamowi.weebly.com/uploads/1/3/1/8/131856369/3d6b013.pdfIn PDF document text
    • https://rakamirun.weebly.com/uploads/1/3/4/9/134904708/nesel_tomozelimoledop.pdfIn PDF document text
    • http://naworigexoz.iblogger.org/song_bechara_dil_kya_kare.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/lixin.pdfIn PDF document text
    • http://xakubilowiva.22web.org/xasamuvokinamu.pdfIn PDF document text
    • https://vadalafazewa.weebly.com/uploads/1/3/4/8/134897988/robuse.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/be745b01f5.pdfIn PDF document text
    • https://gepavemu.weebly.com/uploads/1/3/4/8/134861499/vaxedijofowixatij.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/faduxodiwo/bodmas_fractions_worksheets.pdfIn PDF document text
    • http://fomebitatabapid.epizy.com/characteristics_of_management_by_objectives.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/34807940002.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_off0000da9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9E 5012 bytes
SHA-256: 948115ebd50866672916065ed1b67339c116f1f7d5dfe15d07bfbceea34bf5d3
font_01_sfnt_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 10320 bytes
SHA-256: 6a0e0d55db9605e0c8a4bf14432193cc192d80e70240b4ca32310074e88ababa

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