Malicious PDF — malware analysis report

Static analysis result for SHA-256 162df9de897d0fc5…

MALICIOUS

PDF

75.5 KB Created: 2021-02-15 07:57:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b09f5dd6aa0bdf034aa6694614e7d13b SHA-1: aa0506b54e0a327322e9bb5dcb21a23c5160326d SHA-256: 162df9de897d0fc541d3679afdcfd182f56551f98c9932766391d7ffe8ced776
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or link-farming operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting and UTM parameters, common in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/123?utm_term=watch+glass+online+free+reddit PDF link annotation
    • http://bit7.top/fazilefusa4j87u.pdfIn PDF document text
    • https://cdn.sqhk.co/negixakozaxu/igcjchb/download_lep_s_world_3_mod.pdfIn PDF document text
    • http://catsism.com/casting_crowns_only_jesus_videorht9p.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/jeqggYu/digestive_tract_anatomy_and_physiology.pdfIn PDF document text
    • http://baffer-shop.space/16293339188mic1p.pdfIn PDF document text
    • http://shtangennstutkupitseychas.xyz/oliver_the_virtual_cat_mod_apkn7g2w.pdfIn PDF document text
    • http://timurberg.ru/agile_crm_android_appi39mh.pdfIn PDF document text
    • http://instapresent.site/alkanes_isomers_worksheetqmevv.pdfIn PDF document text
    • http://naturfresh.space/8556857993vckul.pdfIn PDF document text
    • http://dressnbuy.com/word_association_test_psychologyn615n.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/gCihjij/44390039431.pdfIn PDF document text
    • https://cdn.sqhk.co/lijusute/eAvG7QP/wusapiw.pdfIn PDF document text
    • http://reestr.site/basketball_battle_para_pcknf6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revuzulikasulo.epizy.com/40617931191.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/zubumaveputagiko.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/23952995012.pdfIn PDF document text
    • https://s3.amazonaws.com/devuxuzejozam/37986769999.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_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 5296 bytes
SHA-256: 2bd6ef59e068808de5e32fe028cf2bc46746c961871fcbf804b8ab4879f899c8
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 10880 bytes
SHA-256: d8f50585372a8224fd6659cdcb96b79796a1bbbc6b9a71632d15fbf1d0c56d65

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