Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c92078fc928deb2…

MALICIOUS

PDF

74.6 KB Created: 2021-03-14 16:10:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2bc361acde779601ee4b94d5d05fcbb8 SHA-1: 8f64fdf39c825b05fa1ade5672188fb259edb6e9 SHA-256: 5c92078fc928deb2482cb39d3fe698aaf8c2c1919429d4011866f61250df0d9d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors, indicating a link farm designed to distribute malware or lead users to phishing sites. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it's designed to lure users to malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=aua+psa+screening+guidelines In PDF document text
    • https://xosaxunifepin.weebly.com/uploads/1/3/0/7/130739048/9567776.pdfIn PDF document text
    • https://lokesikaneweb.weebly.com/uploads/1/3/1/4/131437695/ratafaxolovu.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/aghNiaX/85208363127.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/gemLjew/download_game_of_warriors_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/lakanodip/zpXDRgc/vibositavulu.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/nawuteraj_pekefubelul.pdfIn PDF document text
    • https://cdn.sqhk.co/pinofizulag/bBz6ijU/toy_football_game_3d_download.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/jenuvo_linigex.pdfIn PDF document text
    • https://vixezijimike.weebly.com/uploads/1/3/5/9/135993975/affd13ad904.pdfIn PDF document text
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/lirawuzupobekujuza.pdfIn PDF document text
    • https://cdn.sqhk.co/furugilenu/ijdsjen/23984491602.pdfIn PDF document text
    • https://cdn.sqhk.co/salobosemiv/Hji4ihG/96552916626.pdfIn PDF document text
    • https://cdn.sqhk.co/xajevedu/jmjagjK/suzipowirokilejonuke.pdfIn PDF document text
    • https://kasezikibojeg.weebly.com/uploads/1/3/1/8/131871727/samozidim_napavi_xugokuk.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvojeve/eggjfgf/pais_presentes_pais_ausentes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kixixiwibatogit.epizy.com/analise_formal_de_uma_cantiga_de_amor.pdfIn PDF document text
    • http://xizefuta.rf.gd/can_you_report_someone_keying_your_car.pdfIn PDF document text
    • http://bokonukavebuso.rf.gd/new_testament_church_near_me.pdfIn PDF document text
    • http://besosive.epizy.com/relaciones_diagrama_de_clases.pdfIn PDF document text
    • http://zavipazo.epizy.com/wood_platform_bed_turned_legs.pdfIn PDF document text
    • http://tubiruk.epizy.com/ba_part_3_exam_date_sheet_2019.pdfIn PDF document text
    • http://sisubupofi.epizy.com/litin.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_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 5232 bytes
SHA-256: 1ffc96c993ec69b43b5978a4045bf712ad97619eabd12f14dd6c858c743921cb
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10796 bytes
SHA-256: 765630060649714bbcd82e1cc860fccb8855306ad3eddc6252a2f7ec6bd63ac8