Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb86b4d09d772cec…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 00:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0e1321d967fc0a280c52575eae7ab61b SHA-1: c45a570d9d4e39f9446eaf7a22984a2a580587b1 SHA-256: fb86b4d09d772cec47600ec25f9ae961e517c8d009d1ac2a80c968af9ab104de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'xajibur.ru', suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xajibur.ru/strik?utm_term=verifone+ruby+ci+help+desk PDF link annotation
    • http://dreabling.online/how_often_to_service_outboard_motorcu4jm.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/d84c46.pdfIn PDF document text
    • http://hytri.com/gojasexuxesobit9jgk.pdfIn PDF document text
    • http://checkmycredit.info/lenguaje_corporal_de_los_gatos_siamesesi9zfj.pdfIn PDF document text
    • http://kmplitka.shop/og_mandino_book_the_greatest_salesman_in_the_worldp7top.pdfIn PDF document text
    • http://doorstepcomputers.com/the_insider_s_book_of_secretsd45cm.pdfIn PDF document text
    • https://gelatotagubas.weebly.com/uploads/1/3/0/8/130813077/mebinurazeruvipefupu.pdfIn PDF document text
    • http://giocodigital.space/63225202090666c5.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/rakapogutorun.pdfIn PDF document text
    • https://deneresibixu.weebly.com/uploads/1/3/4/6/134662350/gesowejivepadavapi.pdfIn PDF document text
    • https://wapixetisabin.weebly.com/uploads/1/3/4/6/134685373/6583351.pdfIn PDF document text
    • https://sabizedikidoxar.weebly.com/uploads/1/3/2/6/132681903/bojijegata-kebezut-mexeneva.pdfIn PDF document text
    • http://3bureaureport.info/64076873409eiplg.pdfIn PDF document text
    • https://zosotise.weebly.com/uploads/1/3/5/3/135393527/45c974fe7a7164.pdfIn PDF document text
    • http://erogan24.website/xutazux4kve.pdfIn PDF document text
    • https://texevipabel.weebly.com/uploads/1/3/4/6/134679186/pabikap_geviza.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/wababewefux.pdfIn PDF document text
    • http://ergors.space/67435279555vvl0s.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/6d8609fb-4b3d-4b43-bf47-f3704eb647c9/vunovedenajevak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91231996-f273-4480-bb9e-865db368f634/35351606652.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/is_there_a_filter_in_the_primo_water_dispenser.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/11222483325.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/xutif.pdfIn PDF document text
    • https://s3.amazonaws.com/zoxewudunigus/the_crown_netflix_season_4_rotten_tomatoes.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/someday_someday_maybe_pilot.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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 5304 bytes
SHA-256: 81aaccffcbcef975447bfd0308a85819172ff372deb05e34dae71617313a8cbf
font_01_sfnt_off00010414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10414 11720 bytes
SHA-256: 42b59bf89406f6985e94800f8f0728d10f5f7f508bfe06819c7107f7976e6dfd

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