Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57d72da2bbbb29d…

MALICIOUS

PDF

75.2 KB Created: 2021-03-29 14:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5eb095a0d07e07fcb2a53335c8fc5a54 SHA-1: 1050d4089e3c413a79f71d27951a42611d5af068 SHA-256: c57d72da2bbbb29d7e02b6af819cdffff59387e154c655dfa21fe1f66e44f129
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mezovuduw.ru/award?keyword=fairy+tales+in+malayalam+pdf PDF link annotation
    • https://cdn.sqhk.co/lunabati/gigJfCB/38602936475.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/gPibiae/vovunuzunuz.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/9KjbvcW/15982501381.pdfIn PDF document text
    • https://cdn.sqhk.co/radofufalam/iidWogc/zabulutowoxadazamekaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jaziwuke/heicPCU/gosifodimupemunimusutab.pdfIn PDF document text
    • http://degakak.sportsontheweb.net/51644746231.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/wjcjjcw/la_liste_de_mes_envies_film_streaming_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/ahaB5z3/colgate_fruit_burst_toothpaste.pdfIn PDF document text
    • https://cdn.sqhk.co/reditifotep/jiieeHs/e_medical_report_canada.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/bifonavapazax.pdfIn PDF document text
    • https://cdn.sqhk.co/tevimuwijile/Kgg7SYE/6810877279.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_1cbe28e28b9f4a228daacf29c2e83f23.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/694886f8-be37-4039-9c49-420edaed08d4/why_is_stomach_pain_bad.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_54fbcaf374da4cc3836abdb947f89944.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6959f4a-c24c-4789-af40-cd70d766dd72/tuzubeminarisinudirazan.pdfIn PDF document text
    • https://1e1f235d-56dd-4976-b20d-d38e3fe7b172.filesusr.com/ugd/210b45_1dfd6924c2394352a57faafd34605ef2.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_2d375eea09bc4a62a57e9991151c61e7.pdf?index=trueIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_3fea585b5f3c46e7b00607fd1635496b.pdf?index=trueIn PDF document text
    • http://viwuwijagabote.myartsonline.com/73820174454.pdfIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_decab47850904620b2e040bb18254d2c.pdf?index=trueIn PDF document text
    • http://piwolimosopobu.myartsonline.com/67228010806.pdfIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_faf87f809fbd421fae09e94c6562f640.pdf?index=trueIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_26b6b53024bd452bb4b823ceddadcd53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/edab09ff-921a-4c6c-a19a-f415fd984901/fahrenheit_451_literary_devices_worksheet.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_6ae45adb76834e8f9712ff714f5243c3.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e58b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE58B 5960 bytes
SHA-256: cf1aea0656652d2938fcd65f2f0cd1864b461c70a7edd972912bd37d415eb50f
font_00_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 5244 bytes
SHA-256: 0d822b27a3e103ee664513f584768d2825a8aabc2a4dbcacbc8f8ecdfccb6998
font_02_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 9868 bytes
SHA-256: a94d0eb93cfe73d69728fe9b67e668cf22013ae439d368917aba8c00f543eda1