Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a53bdb6fe8dacf…

MALICIOUS

PDF

69.6 KB Created: 2021-02-08 17:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3ab4f01d859ec438c507e731a94db7e7 SHA-1: 6e7d1c6c5fe2dd4b208dae2017f692d166c74088 SHA-256: 09a53bdb6fe8dacfd7ceb632c339c6438d8be0c7d41881392cd211cb78f6482c
252 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on disposable domains or known malicious redirectors. The document's content, though heavily obfuscated, appears to be a lure for employment applications, aiming to trick users into clicking these malicious links. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a phishing or redirection tool.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • 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/aws?utm_term=employment+application+form+template+free++australia In PDF document text
    • https://cdn.sqhk.co/muruwake/JidO5h5/76079642942.pdfIn PDF document text
    • https://bobebizup.weebly.com/uploads/1/3/1/3/131381471/5afe043900cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458829/normal_601778c483e9f.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/fig5sid/amazon_music_unlimited_echo_show_8.pdfIn PDF document text
    • http://xuzekamusudis.iblogger.org/messenger_lite_latest_version_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mijajijem/jhe3jam/65144853427.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/hjahaij/loop_yarn_patterns.pdfIn PDF document text
    • http://tujubiluwanodof.22web.org/24931486648.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391605/normal_5fe3f46de81ba.pdfIn PDF document text
    • https://cdn.sqhk.co/gufezitaxato/mrCjgwG/12415611014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382423/normal_5fe8ac765310f.pdfIn PDF document text
    • https://cdn.sqhk.co/dikozogub/iaLJicq/tamil_nursery_rhymes_songs_with_lyrics_and_action.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/dgcwPqF/rolling_sky_mod_apk_all_levels_unlocked_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/1SYhije/89714014710.pdfIn PDF document text
    • https://gasimela.weebly.com/uploads/1/3/1/3/131398285/pojukalowa_zalinazuwubules.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379603/normal_5fdaf2f459b9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_600bb93b4dc7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/48902840052.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/43351377728.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/jorojasanawafuxa.pdfIn PDF document text
    • http://zuluvegutadetu.epizy.com/zekexeje.pdfIn PDF document text
    • http://luzigipo.epizy.com/animals_and_their_young_ones_chart.pdfIn PDF document text
    • http://zogaxogoraf.rf.gd/millennium_development_goals_summary.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_off0000d38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38C 5220 bytes
SHA-256: 6a84d1770c15cd5d4b36b2cab723588dbdb796da8f1ece3110a13b68fee84db4
font_01_sfnt_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 10308 bytes
SHA-256: 77ca9453e1d72fe9a6632141cafba4217572f4ae79752534266fe17b0a37c1f5

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