Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3a8c0a86132caa…

MALICIOUS

PDF

78.3 KB Created: 2021-03-08 23:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a969f5341eed279b50968713729956e0 SHA-1: 7a6dfbeade793b36ec6799015a06a272809f0ea8 SHA-256: ee3a8c0a86132caa1e2b66cc2530d33b71777a313ad654594b5aefe2aec38f85
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV. The document body, though heavily obfuscated, suggests a lure related to 'penny lab chemistry answers', likely directing users to phishing or malware-hosting sites. The presence of numerous external URIs and link farm characteristics indicates a phishing or content-scraping operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://ponafet.ru/wix?keyword=penny+lab+chemistry+answers PDF link annotation
    • https://kozegefiseram.weebly.com/uploads/1/3/1/3/131379202/wododewimajited-fibitevi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_601dbb3f9ca87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418579/normal_5febaa00c6424.pdfIn PDF document text
    • https://jonabosaguvaxak.weebly.com/uploads/1/3/4/8/134858844/6658911.pdfIn PDF document text
    • http://rekubojuxow.22web.org/jafatulopejamebixadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375886/normal_601f1db98441a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_601731be186db.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/purupubaza_gofulujiselin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5fc776c52f21d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481423/normal_5ff3e1bd5b98b.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/732564.pdfIn PDF document text
    • http://zesisoxesevi.22web.org/forex_trading_platforms_usa.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/rawirosiw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tiwobera.rf.gd/c_programming_notes_handwritten.pdfIn PDF document text
    • http://kafuvaxuxele.epizy.com/acca_p4_examiner_report_march_2019.pdfIn PDF document text
    • http://guxenubegipus.epizy.com/pta_meeting_minutes_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845dc3e1-7ce1-4e36-af66-43d327813efb/love_yourself_lyrics_justin_bieber.pdfIn PDF document text
    • http://kidereludabiron.epizy.com/worksheet_grammar.pdfIn PDF document text
    • http://sikejafomanama.epizy.com/gutogibotakuwolepatej.pdfIn PDF document text
    • http://kifagugurubox.rf.gd/bhagavad_gita_chapter_2_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae68546-7012-4060-a853-9d74c4ef98d5/lovazuveroxomazuwuxisonup.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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 5052 bytes
SHA-256: 41afa81e715d44be6b4dbfdf40a7fe6c89f8a051102a1ee617ce2f1cef4a5f37
font_01_sfnt_off0000f8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F4 10824 bytes
SHA-256: 11fc66b6cf76bdc2b551e9f4bb282fd407dbc7a87f4445a0b80e8122a20fb332
font_02_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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