Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8c1969627d4892…

MALICIOUS

PDF

72.4 KB Created: 2021-02-16 22:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ab2979a7570a4c0285712a18709f8483 SHA-1: 07e443c4eda24fe8338bfeff0a0cf49619bbfd14 SHA-256: 9a8c1969627d48920fbc06ac6a02d113c0c687f0bf9de01e2a46b521ac627deb
192 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs and a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to potentially harmful content. The presence of a 'Download Now' lure and the ML classifier's high confidence score further support its malicious nature. The document body, though heavily obfuscated, contains keywords related to downloading software, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=game+killer+apk+download+no+root In PDF document text
    • https://cdn.sqhk.co/zawileveruz/gggf2jg/gajizatuxofu.pdfIn PDF document text
    • http://gopexilif.22web.org/avira_pro_crack.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/tighaia/movies_2019_list_comedy.pdfIn PDF document text
    • https://cdn.sqhk.co/paparidew/jiSPw6Z/how_to_disable_parental_approval_for_apps.pdfIn PDF document text
    • http://muvirire.22web.org/what_is_50_shades_of_grey_on.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/Pssjhd3/golf_on_mars_spin.pdfIn PDF document text
    • http://fetisaletom.iblogger.org/busonid_50mcg_bula.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ijjh7VC/love_letters_in_the_sand_pat_boone_lyrics.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dixuzudes.epizy.com/lovuzirer.pdfIn PDF document text
    • http://zaxutakizet.epizy.com/template_foto_kolase_wedding.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/contact_us_page_template_html_bootstrap.pdfIn PDF document text
    • http://latowetutut.epizy.com/zukulemiduzowodalufom.pdfIn PDF document text
    • http://rajixubododafu.epizy.com/silokonagovaxosetivuver.pdfIn PDF document text
    • http://wuzatefiroko.epizy.com/taveruludagipiwadosu.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/mefijusomibere.pdfIn PDF document text
    • http://mikesivu.rf.gd/instagram_hashtag_reports.pdfIn PDF document text
    • http://feselipalez.epizy.com/maturidi_aqeedah.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_off0000dfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA6 5116 bytes
SHA-256: b27fe60e1eb4499d520f779fa46b16b83a46712a30a7f055880e0eb69941b25f
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10400 bytes
SHA-256: 99d0d9885c1eb8480d1b868111463ac0e1f937b948a8072ffcf02b8c8b94b17c

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