Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6672d2be489fff…

MALICIOUS

PDF

96.0 KB Created: 2021-03-03 01:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a5396f20a46135e91323a114ec4d3287 SHA-1: 07f5a58cd74d631ab1ef92b8df6da618a1f87b11 SHA-256: 4c6672d2be489fff9465375ce950206ef8e874ff1216797684f94d4c5c46668f
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://lozipotod.ru/wix?keyword=markov+chain+calculator+with+steps PDF link annotation
    • http://bosnoslovnoejelaniekupit.xyz/52844085422nrqap.pdfIn PDF document text
    • http://helpforteam.com/tv_cartoon_characters_60_s_70_sydleg.pdfIn PDF document text
    • http://geloritiveda.mygamesonline.org/71457344678.pdfIn PDF document text
    • http://oneitstore.info/524516034894etfk.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/bourbaki_elements_of_mathematicsnvocy.pdfIn PDF document text
    • http://lunatan.medianewsonline.com/28124012809.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/53710944375.pdfIn PDF document text
    • http://sale50.pro/xunojunuvejovulogeo5qky.pdfIn PDF document text
    • http://quinzsy-studio.design/leaf_anatomy_lab_answer_keysrch6.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/bepukuba/apologia_biology_module_10_study_guide_answers.pdfIn PDF document text
    • http://ralivapoked.epizy.com/fur_elise_piano_letter_sheet_music.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/4th_grade_grammar_quizzes.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 5244 bytes
SHA-256: b0583bd2e9ef9b7ff37216a39fd602f0ad1a8ed3fbb6ad059491a90bdd38345f
font_01_sfnt_off000136e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E4 11884 bytes
SHA-256: 917bac09432a5eec9747e1ba50d989eca1dc5a166c366a0caaa81fd8ea631b38
font_02_sfnt_off00015e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E33 16060 bytes
SHA-256: 1c92c2677a7211bdb9cbf3aa97d18a342ff658e3f18f612691e6cda1cc848129

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