Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9dfbdc81ca724b…

MALICIOUS

PDF

80.5 KB Created: 2021-02-18 02:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9d8b6f7aaae47c940e3598ab38cbad66 SHA-1: 5aa3250634ce6d31a56d7238111704602a7dd00c SHA-256: bd9dfbdc81ca724b587645983dcdd9c2fa5f526c7835254932714b6c6a4a6305
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, many of which are flagged as malicious redirectors or hosted on disposable infrastructure. The document body, though heavily obfuscated, contains text related to 'democracy' and 'definition', suggesting a lure to disguise the malicious intent of directing users to potentially harmful sites. The presence of multiple embedded URLs and the heuristic firings strongly indicate a phishing or scam campaign.

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
  • 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://crophysi.ru/strik?utm_term=what+is+a+democracy+simple+definition In PDF document text
    • https://cdn.sqhk.co/dopuwene/dxhasyf/75737378292.pdfIn PDF document text
    • https://fupobemoxu.weebly.com/uploads/1/3/4/6/134669325/cc0025.pdfIn PDF document text
    • https://cdn.sqhk.co/vobipibomuk/hg5mifF/bingo_win_real_money_no_deposit.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/R9H9Qhb/zugatitifubowonopabop.pdfIn PDF document text
    • https://cdn.sqhk.co/ripalufix/dgeYyjj/69346691978.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472753/normal_600a748550d57.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/ba3MJdW/voxizomigadidizezuxo.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/hfjd1sZ/nilalepogufapaxineke.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/5747472.pdfIn PDF document text
    • https://cdn.sqhk.co/minutakumu/CJKGahj/word_2016_online_templates_not_showing.pdfIn PDF document text
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/cbf50da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vitupofelomar.epizy.com/tubemate_cracked_apk.pdfIn PDF document text
    • http://bibalaluroxute.epizy.com/36568533393.pdfIn PDF document text
    • http://pesuvomekujidi.rf.gd/defence_law_manual.pdfIn PDF document text
    • http://manutilo.epizy.com/47959085063.pdfIn PDF document text
    • http://dopodisimedu.epizy.com/animal_crossing_new_leaf_train_face_guide.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_off0000ff04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF04 5508 bytes
SHA-256: f1fe96b4695bd13ddf870cfa5188a8829c935cdcd596bc6da55ecd059c3cfb62
font_01_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 10280 bytes
SHA-256: 1aec08876f534ec4e50acda2146224244a6948c75b2e8a0c6fec57092c634ce4

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