Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f82751090e8d4bd…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 11:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cdf5e41f96203fed3c1efeee4867f200 SHA-1: 3c67e335dbd9ddec5047f8129dffb974ea8129bf SHA-256: 8f82751090e8d4bdd662d8754e25c1669bcadcb9baa1693d9acb7804b8887604
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm hosted on disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The primary IOC is the redirector URL, which likely serves as a lure for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=chicken+soup+for+the+teenage+soul+quotes In PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fe2541b21172.pdfIn PDF document text
    • http://wetepuzasuvuroz.22web.org/free_cloze_worksheets.pdfIn PDF document text
    • https://xurugafidas.weebly.com/uploads/1/3/6/0/136081795/pidizut.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/jdhaSii/resident_evil_2_codes.pdfIn PDF document text
    • http://gojepifega.22web.org/gowidop.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/Koiihc4/parrot_sounds_talking_singing.pdfIn PDF document text
    • https://dufadijikog.weebly.com/uploads/1/3/5/3/135325035/jidaxevigovujis-dofoxexana-luxiwetaluleva.pdfIn PDF document text
    • https://cdn.sqhk.co/tovipovo/DAhsgfa/nogoramasafo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5fc7474caaf0b.pdfIn PDF document text
    • http://xizerunax.scienceontheweb.net/symbolism_in_things_fall_apart.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_6023d0919e9f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fd11dc6ba5eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c3b72a-f8aa-4976-a90e-bcf2ecec5aef/nojeliwinemalonuzaguwuf.pdfIn PDF document text
    • http://badozalusubafux.epizy.com/nice_looking_table_in_excel.pdfIn PDF document text
    • http://sanonusujinuz.rf.gd/66746205141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f44dc653-2e40-4ba7-99bc-6e8cdb9e99da/architecture_oculus_define.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab5d43bf-6f24-49fc-8ee4-cb6a06c335c4/why_would_my_water_softener_stop_working.pdfIn PDF document text
    • http://vatonafikokex.atwebpages.com/cancer_de_tiroides_elsevier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b127132-db59-47b3-9ac0-df257eaa8d58/lilijedila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac07cf88-a88f-4e40-8ed3-12f9674cab70/maxejad.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/26203418559.pdfIn PDF document text
    • http://vusotinodobofo.rf.gd/goduninejos.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_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 5372 bytes
SHA-256: 39bc69f39ad6baad200ffccea931c4e179adb47aa3dc3a4cd6b54c5e68f49b55
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 10944 bytes
SHA-256: 61ba1734c0c6019e4c85adce7ccfb16f392a8339d251b1a5efbb830361efc92b

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