Malicious PDF — malware analysis report

Static analysis result for SHA-256 166709d05f953db0…

MALICIOUS

PDF

77.7 KB Created: 2021-04-20 20:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1371ebe6b9d592b1cd9299ae7759d130 SHA-1: 2010787b9e973c90adbfcdc0a3cbf34e155100c8 SHA-256: 166709d05f953db0e9e5e47d8a6f971cbe974da9c2c9553db183eaf07b87c4d5
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were extracted, the presence of malicious links and the ML classifier's high confidence score point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=echo+pb+250ln+leaf+blower In PDF document text
    • http://mivejuvididu.66ghz.com/95585531240.pdfIn PDF document text
    • http://fifanaganogagu.22web.org/26615505892.pdfIn PDF document text
    • https://cdn.sqhk.co/tazakabebilo/fvKhagi/87413081287.pdfIn PDF document text
    • https://cdn.sqhk.co/gapirofi/jbjgMhf/chinese_english_translator_app_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/h7gfnHk/pibonifesokafabunamemepom.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/hg9giaI/34070735703.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/wuwabobujasivor/speakout_starter_activeteach.pdfIn PDF document text
    • http://vapasiwivomod.epizy.com/alphabet_drawing_pictures.pdfIn PDF document text
    • http://pisozew.rf.gd/atlante_anatomia_microscopica_wheater.pdfIn PDF document text
    • https://63aa7d51-6c54-48cc-ac87-b710a0da19c3.filesusr.com/ugd/c8d394_75efc9a73f2e41c5b11bc4507ebbd178.pdf?index=trueIn PDF document text
    • http://teguxivufir.rf.gd/danexaxidoritikowiwawasel.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/37188082749.pdfIn PDF document text
    • http://gonoluripep.rf.gd/exponential_logarithmic_functions_worksheet.pdfIn PDF document text
    • http://fumojaj.epizy.com/nigivesuxugilimumebivu.pdfIn PDF document text
    • http://mivowejow.rf.gd/degesavogudozasika.pdfIn PDF document text
    • https://73099f28-10d5-4558-98a1-2f8dc61f1a2f.filesusr.com/ugd/f62eaa_090fd16837964c2594fbc26d37ee7b4a.pdf?index=trueIn PDF document text
    • http://mokupemoraworal.epizy.com/baal_veer_returns_episode_8.pdfIn PDF document text
    • https://39c10a3a-92c6-412a-a1bb-b8a1fc48fbc4.filesusr.com/ugd/259099_b237829fe94c46929ae163561ca6fb61.pdf?index=trueIn PDF document text
    • http://xonelamurojili.rf.gd/vugasitevaka.pdfIn PDF document text
    • http://gedalexi.rf.gd/bnf_and_ebnf.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_off0000f055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF055 5512 bytes
SHA-256: 2d1df0467b73aa6d690312f3cf3a0266effdece7d4e8f09a073031bb6f59c856
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 10816 bytes
SHA-256: 7298abbf99af2078504ed175c761fef0ae9772d5c202ac54cab6cdbb5a9c71ef

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