Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b892119951d5e7…

MALICIOUS

PDF

76.3 KB Created: 2021-02-06 19:49:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b2ef9d3bca7332dbbe5661017a520bd SHA-1: 2981b9fc8174865938371f37e0bb801ee099b88a SHA-256: 42b892119951d5e778136df446ef65d4a185759ffdb32fd1501e14fc0ad90c27
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=ssc%20stenographer%20form%20online PDF link annotation
    • https://buderenedisam.weebly.com/uploads/1/3/5/3/135302361/soxegexa_sebasufedeluzo_punupikiku.pdfIn PDF document text
    • http://bezprovodov.guru/netgear_r6900_vs_r70005inyh.pdfIn PDF document text
    • http://smotrikino.fun/vawakeginugakujexibibim5tmh.pdfIn PDF document text
    • http://montana-media.com/a_glossary_of_literary_terms4xsuf.pdfIn PDF document text
    • https://fomememuvur.weebly.com/uploads/1/3/4/0/134000402/48695f.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/fozowipu.pdfIn PDF document text
    • http://mizarofu.22web.org/zafiji.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/jojuvedivewarimewu.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/mugijebuwojuso.pdfIn PDF document text
    • https://lafevisok.weebly.com/uploads/1/3/2/6/132683062/ceea7df.pdfIn PDF document text
    • http://iblack.space/kiteworks_administration_guide33ki9.pdfIn PDF document text
    • http://volosaty100.xyz/42677137063pe5pi.pdfIn PDF document text
    • https://wojaginobaxap.weebly.com/uploads/1/3/1/8/131857211/lixom.pdfIn PDF document text
    • http://cupe1.ru/equivalent_fractions_worksheet_ks3_tes0vqm0.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/vadifufoxovavekexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fozujapajus.epizy.com/73876939154.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/79077265784.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/best_app_for_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/android_dialog_background_color_transparent.pdfIn PDF document text
    • http://luvoximod.epizy.com/vacuette_blood_collection_tubes_guide.pdfIn PDF document text
    • http://venavabumekaj.epizy.com/wenanoputefoxem.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 5532 bytes
SHA-256: c152db5687d7db9b32c0e02b7faf1dbbec88c481b8ad2e82fb0e1cc4aa06b29b
font_01_sfnt_off0000ffec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 10592 bytes
SHA-256: cfa29384a865375b6b242e0aaf7e892d831800a8fa0e0803bacedb410115d965

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