Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5062e894bea96c…

MALICIOUS

PDF

81.3 KB Created: 2021-03-13 16:25:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 104c9d0f599678b3596c86e3035ac9d3 SHA-1: 775db5bdbb04cc7f0aaa0e04706c9eb4483f5987 SHA-256: 3f5062e894bea96c32f9efa969c4b39f833360d4351f497e79f9a8d53d080a36
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URI pointing to 'seumenha.ru', which is likely a malicious domain used to distribute malware. The document body, though heavily obfuscated, contains text related to software downloads, reinforcing the phishing lure.

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://seumenha.ru/strik?utm_term=oracle+database+download+for+windows+7+64+bit PDF link annotation
    • https://cdn.sqhk.co/suwuwewazaka/ggcjhh5/nimiloxexuxagivepig.pdfIn PDF document text
    • https://cdn.sqhk.co/gepaxulunan/4wjbhgE/chester_ft_dalisoul.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/why_is_my_galaxy_s8_not_connecting_to_wifi.pdfIn PDF document text
    • https://cdn.sqhk.co/gevanadu/1aifihc/32376695352.pdfIn PDF document text
    • https://cdn.sqhk.co/kufiremikaf/gYYhhhg/zifilugozubimimufu.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/n8gfzhg/bilozubijomoratitavufog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_9d219a6dbd814c7fbe3cc86c02c5f92c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/20d9c01d-b176-4682-aeea-ff88fafe5ac4/30686569732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/069e3544-02c7-43f2-9195-b7bd704d1898/what_is_32_bit_and_64_bit_in_hindi.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_b53e8e94cab240e3b736d3e5459ab0ee.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bezorito/wetotegamipekawudufi.pdfIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_82e4b1bdb3844fb099f5252a0ebe5259.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e88d5f5d-868d-46a9-a9c5-55ac76d093c7/fusifuz.pdfIn PDF document text
    • https://s3.amazonaws.com/wetevali/login_page_html_bootstrap_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b401807-27da-4673-a416-482ca968c022/tascam_dr_40_manuale_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0627a81-4b34-4db8-b15b-4a175de26c65/xarimetadepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d408c23-d85a-41ae-98b8-315ba7ff6714/visawipofujozuwokir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/475bed5d-752f-4f48-ad87-03f4200a3768/how_to_connect_polk_soundbar_to_samsung_tv.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/probabilidad_y_estadistica_para_ingenieria_hines.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF90 5384 bytes
SHA-256: d5a5f223e08d7049fbb3cbd956a3909346ed78d76f70460ad4df1a93eb82019f
font_01_sfnt_off000101fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 11756 bytes
SHA-256: 2bb4ff5d4846b09c16e00c77cf81c6520ae6d4ff317e639cadcf360221e8211f
font_02_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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