Malicious PDF — malware analysis report

Static analysis result for SHA-256 662944f6658a20be…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 11:15:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7c3ee7eadee5e6f385f97284906b475d SHA-1: a8df9c3bf31e41c448ecba6e727f0e163d3cdd7c SHA-256: 662944f6658a20bed3b14d3433625cb04248dd22cd2703eeab33c221c16a4596
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirector infrastructure designed to distribute malicious content or conduct phishing. The presence of these links strongly suggests an attempt to lure users to external, potentially harmful, sites.

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
  • 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 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://dafemum.ru/strik?utm_term=how+much+does+a+mechanical+design+engineer+make In PDF document text
    • http://fajujefa.getenjoyment.net/thats_the_ugliest_thing_ive_ever_seen.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/which_is_the_best_b_complex_tablet.pdfIn PDF document text
    • http://drilltech.info/61045272785kj91x.pdfIn PDF document text
    • http://daating19.site/sovameminoxujejoneqgvdd.pdfIn PDF document text
    • http://vamoktin.ru/muwagemegowonepcmsor.pdfIn PDF document text
    • http://nosatines.mypressonline.com/pisipameloralumun.pdfIn PDF document text
    • http://usechambre.xyz/activator_office_2016_professional_plusy26ip.pdfIn PDF document text
    • http://garant-ritual.online/xitotemoserotofidikipazolpnxp1.pdfIn PDF document text
    • http://domavera.ru/zisogabuxadunosokazorex7291m.pdfIn PDF document text
    • http://sale50.pro/285206895641zu10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472200/normal_600336252ec81.pdfIn PDF document text
    • http://mixezitubut.mygamesonline.org/es_mejor_comer_despues_de_hacer_ejercicio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_60120a5db3818.pdfIn PDF document text
    • http://molotkov.site/glencoe_algebra_1_booke553w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexukavibume.myartsonline.com/zakimotino.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/what_is_casual_leave_in_india.pdfIn PDF document text
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_8a4eb320ffd64acba137cbd96ebabdad.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_9b69fd6f018f48fb9c5aa6500a7caf73.pdf?index=trueIn PDF document text
    • http://tediguku.atwebpages.com/59245859729.pdfIn PDF document text
    • https://11e0ccb5-01dd-4757-ae93-f6f3b4f5ca32.filesusr.com/ugd/1a2ce6_5dc6e745658e45a59e2a3ef365aee2da.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_680339d2cddc47b08db6715381693911.pdf?index=trueIn 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_off0000e93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93F 5468 bytes
SHA-256: 39e9e9317132d2c6392e1a36cbe67dbed20212b1b969fe5a7703425b44cac538
font_01_sfnt_off0000fbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB9 10564 bytes
SHA-256: 9fe4de621e4c04ff6b83870443552c679adae24e36c1d824bbf204266666c8b0

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