Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a786041385aaef…

MALICIOUS

PDF

100.8 KB Created: 2021-06-11 21:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 286fc8b30c4e8f6921c471495b611343 SHA-1: 5a7a34df3682a3cc045bbca7b7517f6d6de6c5ea SHA-256: a3a786041385aaef2814218e4ca963d553719f89c0220addc308ee3614ea14bb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://ketchas.ru/pbw?utm_term=antonyms+and+synonyms+for+cat+exam+pdf PDF link annotation
    • https://fivubiforozoxi.weebly.com/uploads/1/3/4/6/134676017/vurujivo_bafobupawujinep_rusani.pdfIn PDF document text
    • https://sizadomuwegemos.weebly.com/uploads/1/3/5/3/135335556/kelijibiv-gaxakaxif.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/d8fdd.pdfIn PDF document text
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/rorugonepigedipazobo.pdfIn PDF document text
    • https://lewixukulir.weebly.com/uploads/1/3/1/6/131606807/kikasikif.pdfIn PDF document text
    • https://lusanazuwade.weebly.com/uploads/1/3/4/0/134000197/48fe377358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144501051/namaz_ka_tarika_sunni_urdu.pdfIn PDF document text
    • http://lifelekufa.pbworks.com/f/chatrapati_shivaji_maharaj_hd_images_download.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144412263/9805275689.pdfIn PDF document text
    • http://gogevuz.pbworks.com/w/file/fetch/144957108/mobdro_apk_for_mxq_box.pdfIn PDF document text
    • http://buwutel.pbworks.com/f/why_is_my_rca_antenna_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c643c320-0b71-4edd-8ccb-26353c89b184/robert_ottman_music_for_sight_singing.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/w/file/fetch/145120224/vce_to_converter_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd09ebfc-1e4f-449d-83d2-c930627e9985/75520574457.pdfIn PDF document text
    • http://tagiruxot.pbworks.com/w/file/fetch/144930810/66279435113.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/ingenuity_baby_convertme_swing-2-seat_instructions.pdfIn PDF document text
    • http://ruxafonan.pbworks.com/w/file/fetch/144796704/what_movie_is_aquarium_from_carnival_of_animals_in.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_off00014ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCF 5428 bytes
SHA-256: 9ec76f9ca6cba22a108ae86d55a346c14eb3766d3bfa3df1143f8479c9f73f71
font_01_sfnt_off00015f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F42 11552 bytes
SHA-256: 52529d3569f995595bb41e69450599ebe118d2918439c558bb34acac092b876b

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