Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4165c8111242e94…

MALICIOUS

PDF

78.3 KB Created: 2021-04-11 00:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 18d0dfb0cbd66e9fe6180e8465b14918 SHA-1: 1d86e7d21d5a1cf81c0f1f75c0f52638544608eb SHA-256: d4165c8111242e94dca021d5c59ddf4ad6393f0873f2d7ee0000ddfd1bfc539f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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
  • 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://dafemum.ru/strik?utm_term=research+methods+in+psychology+shaughnessy+pdf PDF link annotation
    • http://instapodarok365.site/pekinifezebanugeritapidalhy5om.pdfIn PDF document text
    • http://instacopyrightcenter.com/nabigde6kw.pdfIn PDF document text
    • http://shtangye.xyz/wekojirotezutokomesnikh9.pdfIn PDF document text
    • http://boost-store.net/figure_of_speech_worksheets_for_grade_8_with_answersitn7s.pdfIn PDF document text
    • http://legko.travel/81778680908xogsr.pdfIn PDF document text
    • http://shishkin-seed.xyz/kuxavoxodinugefaswle4q.pdfIn PDF document text
    • http://xavadomitom.iblogger.org/hygiene_practices_of_food_handlers.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/brother_hl-l2380dw_printer_offlinezgxdd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zarelaxa.rf.gd/novudisefisora.pdfIn PDF document text
    • http://wijobofeforot.epizy.com/zuvufisikut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cc27efa-1e41-4a75-afcd-c3b716d9e6a2/96389477143.pdfIn PDF document text
    • http://kunovudulex.rf.gd/platform_7_hours.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/6010325508.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_7840423a6e7c4afcabcf3c774b971c91.pdf?index=trueIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_6a2ea177bd49440c8645f39c7bd392b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d564e9ee-b0ba-4ed7-b44f-52edd1c8a019/15156520611.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/gexobogigawonunesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8676ef2-cbb6-4fba-934e-82bccb90907d/26557208626.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/causes_of_plastic_pollution.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/70879050575.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95fab88b-85f5-4982-bd9d-e8fa04205fe0/51310243420.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a0d537-af24-41c3-9bf9-90ca9177e76d/posie_libert_paul_eluard_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/59622658496.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5680 bytes
SHA-256: f8a75b732293d3c8809edd30a5570978328a9eadeea873ee7c3a6e8b4e47fa73
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 11584 bytes
SHA-256: 2c131b96aafc2c96bb8cc216ee9c386eb6a18905b863aee0630755e2df89489d

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