Malicious PDF — malware analysis report

Static analysis result for SHA-256 151e3ad808db1fe8…

MALICIOUS

PDF

75.1 KB Created: 2021-02-20 15:09:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cab11d6a1873bc4510bb8a16e42bb31f SHA-1: 5ea76f80b0635c5779836a69b6772f56e314e0a2 SHA-256: 151e3ad808db1fe84d79d711211c0b5db236fd1fb6772605f509ac95d02c47fa
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to potentially malicious sites, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The primary function appears to be redirecting users to external resources, likely for phishing or malware distribution.

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://crophysi.ru/strik?utm_term=air+force+1+high+top+blue In PDF document text
    • http://cosmeteca.com/nubanazumiosgyc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462362/normal_5fffbbfb7c9de.pdfIn PDF document text
    • http://motivawka.online/30494961125adfyh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479235/normal_5fc6a1ccc47e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601a5d30bab4c.pdfIn PDF document text
    • http://zegoves.22web.org/amatic_sc_font_family_free.pdfIn PDF document text
    • http://zerkalo-fugicar.website/gastroenteritis_acute_guidelineanfqb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_6010d08667a20.pdfIn PDF document text
    • http://perinolaguzur.iblogger.org/malayalam_movies_2019_tamilrockers.pdfIn PDF document text
    • http://datingsexchat.site/gexonezat00cah.pdfIn PDF document text
    • http://azalea.store/pelusedowafujebarewevafujn3xi7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413701/normal_601a493faa185.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487200/normal_5fec8f80d19db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366350/normal_5ff598757fe6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448984/normal_6022e274ad224.pdfIn PDF document text
    • http://lynciguest.com/74029502720qfrae.pdfIn PDF document text
    • http://vnds-v.website/movie_director_simulator_hack_mod_apk6klxd.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/foneniz/avadh_university_ma_private_form_online.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/6992996380.pdfIn PDF document text
    • http://novoboninixeme.epizy.com/3235044590.pdfIn PDF document text
    • http://mafonoxerinomif.epizy.com/manual_de_casio_fx-_350_es_plus.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_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 5068 bytes
SHA-256: 699294e5bdfdba5bd75902dc18f0d9323976e22798a047f7c24134c0de0adc0b
font_01_sfnt_off0000fb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB52 10596 bytes
SHA-256: b2c055703fcb974fbba547b6df8e32afded3344bafa14f6719dc7014b41ddde1

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