Malicious PDF — malware analysis report

Static analysis result for SHA-256 0238d107e4221bdd…

MALICIOUS

PDF

115.4 KB Created: 2021-03-14 04:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 08d49cb6c0ee0c490639d1e235bc241d SHA-1: 28083f56fdc77d9f5e32b247cc51ddda18a01ba2 SHA-256: 0238d107e4221bdd6fc25e9c6cba28f31d7eaa5acc9f2f011b390356a8c8092e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO manipulation. The primary function seems to be redirecting users to these external resources, which could host further malicious payloads or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/strik?utm_term=adverb+zu+bad PDF link annotation
    • https://nabivedoki.weebly.com/uploads/1/3/1/4/131407492/36f1d0bac4.pdfIn PDF document text
    • https://leduxuma.weebly.com/uploads/1/3/2/8/132814900/4489407.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/hdiehgl/fairy_tail_high_school_musical_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/kijji3t/retroarch_linux_core_updater.pdfIn PDF document text
    • https://xozavefo.weebly.com/uploads/1/3/4/0/134018900/c12bcc29.pdfIn PDF document text
    • https://luwanolukurodo.weebly.com/uploads/1/3/5/3/135397368/1362880.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/eiebghR/95338877637.pdfIn PDF document text
    • https://witukuvufun.weebly.com/uploads/1/3/4/8/134895732/3d89eb.pdfIn PDF document text
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/1261545.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/jjij2je/kidajibafefalatinurarek.pdfIn PDF document text
    • https://dariwatipizodaf.weebly.com/uploads/1/3/5/3/135323996/voregagisafo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_6fd16f2b32ec4115893b0d617ddeae05.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7ca7d0-37fb-4754-9165-0632a1a05824/28011506417.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_e5e2c345e7af41e481fcb6b5e327c989.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_f30ba102487c46ec9a58be96bcea87de.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/907f15fd-3c0a-4667-926a-23c69f87ec98/what_to_do_when_needle_is_stuck_in_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e530c7-850e-4e62-997a-139c02ff7bba/35017087484.pdfIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_3e8c8caa10bc4e55a0f892cd4729e0e6.pdf?index=trueIn PDF document text
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_86e4fd386b8e4c9fa510f65e982b1f25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4654cd3d-2fa4-42cc-8e0a-0301cc53426b/como_yo_te_amo_english_lyrics.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_2d8bc0dfa43f403991a1a9ca89cc291f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e2c618-7048-4c83-bce3-113ae4a4aa79/beneficios_de_la_lactancia_materna_para_la_madre_y_el_nio.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000139c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 18804 bytes
SHA-256: cca1773067658443174ebfd756e7e3f5ea71200b5ce86d1755dd5d0969ab853e
font_01_sfnt_off0001752c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1752C 4848 bytes
SHA-256: f8fb2edd1d8a70d1d3934be3b73d417f5c41cfa3322ca82e4a6c226d7f55851c
font_02_sfnt_off000185c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185C4 26224 bytes
SHA-256: 5a2cb7e96e2f41c5a20e7f83551ea3ab20ba02ffab85e6ca96c5d92ff329affb