Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e4f33cde882e80b…

MALICIOUS

PDF

72.7 KB Created: 2021-01-20 06:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: aa946c24a40fda5241dccbd25bfe541e SHA-1: c1aeefec093012dd440c8ec5fed1aa06957869ab SHA-256: 5e4f33cde882e80b0414986a6f76e1e378fa87b2666d2c34245a3bade1bcc233
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically classifying it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it functions as a downloader or redirector for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafficel.ru/123?utm_term=blank+tie+dye+shirts+wholesale PDF link annotation
    • https://tapidokebijimub.weebly.com/uploads/1/3/4/5/134577153/refafoziregix_zewoma.pdfIn PDF document text
    • https://mapaforidax.weebly.com/uploads/1/3/4/0/134012560/6118447.pdfIn PDF document text
    • https://cdn.sqhk.co/situdejoj/R3QhODM/dead_ahead_meaning_idiom.pdfIn PDF document text
    • https://site-1171714.mozfiles.com/files/1171714/hanuman_bhajan_video_song_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5f9604135b20e.pdfIn PDF document text
    • https://site-1178778.mozfiles.com/files/1178778/clue_game_board_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/1yG5k8q/57802269803.pdfIn PDF document text
    • https://site-1250167.mozfiles.com/files/1250167/sutopexixovowar.pdfIn PDF document text
    • https://cdn.sqhk.co/sagitusat/dhbJ5eX/la_liga_golden_boot_race_2019_20.pdfIn PDF document text
    • https://cdn.sqhk.co/ritapabinap/5rBfH80/12272687323.pdfIn PDF document text
    • https://sitepofom.weebly.com/uploads/1/3/1/4/131438718/68e2001fa3.pdfIn PDF document text
    • https://bezubimuxidisa.weebly.com/uploads/1/3/1/4/131453869/3171793.pdfIn PDF document text
    • https://site-1180648.mozfiles.com/files/1180648/91005561292.pdfIn PDF document text
    • https://cdn.sqhk.co/narulaloro/jaRifKb/world_of_bingo_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gikunixa/ggjiYPi/jumomaj.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/jaWeYzH/15159739571.pdfIn PDF document text
    • https://cdn.sqhk.co/zetanitanedo/LJBib73/24983958302.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/chaggpr/23445770298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://refewebol.epizy.com/54168616702.pdfIn PDF document text
    • http://titomozuluvexov.epizy.com/buvonuvisigik.pdfIn PDF document text
    • http://xatabiraluxuded.rf.gd/fill_in_the_blank_synonym_worksheets.pdfIn PDF document text
    • http://kejufunekopal.epizy.com/lilarutopasofovefaxaled.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_off0000de01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE01 5220 bytes
SHA-256: 780bdf22084b02dca5b953497c05612a5a2eb478d9a7c47b3bb8aff643ce5a02
font_01_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 10948 bytes
SHA-256: 266187d90215e87ee2d36c95982892cf0187dd917d349a93e979352fd4b719ef

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