Malicious PDF — malware analysis report

Static analysis result for SHA-256 3825d373ec547a15…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 17:00:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d44e1981c44254030d8e8e4a6a961246 SHA-1: fe41dea7a816af59181bfbd00756a83649ad06ea SHA-256: 3825d373ec547a159224f16758c0878b6276127f8ee44dc7e405df1638fc82e7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file exhibits characteristics of a malicious document, including a malformed active-content stream and numerous embedded URLs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a link farm and the use of a malformed stream suggest an attempt to exploit PDF vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://seumenha.ru/wix?keyword=mechanical+plans+examiner+study+guide PDF link annotation
    • http://carbackseat.site/ligedufh9riv.pdfIn PDF document text
    • http://yoga-fitness.space/does_kitchenaid_repair_mixersl5wrz.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/gOhyjgd/classlink_fulton_launchpad_login.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/livabojuxavimukepajemuq3jh.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/fozhdBK/organic_balloon_arch_atlanta.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/echbdX1/candy_crush_soda_saga_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/eVjipFT/gezomezabinatoxadob.pdfIn PDF document text
    • http://mstmail.space/104918719037xp1i.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/16455160148.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/2380259937.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/97974025262.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/56954357134.pdfIn PDF document text
    • http://badgesverified.com/wozomoacadk.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/duH9jig/history_and_history_of_art.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gosaduzunake.myartsonline.com/what_is_the_best_vegetarian_meal.pdfIn PDF document text
    • http://sanugifop.atwebpages.com/gofobirebenemobilusipi.pdfIn PDF document text
    • http://vunonam.atwebpages.com/2005_chevy_malibu_starter.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/ap_stylebook_free.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_off0000edd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD0 5664 bytes
SHA-256: 83a6d3f242526f5b3be82bff0304a572dcf2bbe7b91ab749c74a70404b14cc93
font_01_sfnt_off00010103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 10256 bytes
SHA-256: d7efbbbccd3bed9b48c40d0e5abe63f0f67bc85dcbf5fe70586bb9b1a0bfd651

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