Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d7b682c2344af4…

MALICIOUS

PDF

84.9 KB Created: 2021-03-15 08:32:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 03776ea82ef9d2d4c41cad2238f0403b SHA-1: 0f431de3d7cdbd4702a4ab97c59c8139d3f5b84e SHA-256: b7d7b682c2344af44c0b351bf63fd0ffb3d44cf35db1d23b5778450b063d578e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://golowaki.ru/award?keyword=78xx+79xx+voltage+regulator+pdf PDF link annotation
    • http://uscreditreport2021.info/sat_exam_2017spqlj.pdfIn PDF document text
    • http://zijaditenup.getenjoyment.net/1120444345.pdfIn PDF document text
    • https://wimavebitajiki.weebly.com/uploads/1/3/4/6/134609796/gitodobabaxenelipol.pdfIn PDF document text
    • http://idealica-italy.site/kung_fu_panda_3_full_movie_in_hindi_download_filmymeet6tpmy.pdfIn PDF document text
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/lalok.pdfIn PDF document text
    • http://kipokefurur.mygamesonline.org/56828064739.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/60385674817.pdfIn PDF document text
    • http://zuxemesemubozo.mywebcommunity.org/beginning_ukulele_chord_chart.pdfIn PDF document text
    • http://mebel-albero.ru/kawetezepodu0ai4m.pdfIn PDF document text
    • http://menbp.online/ielts_reading_question_typesgfpwf.pdfIn PDF document text
    • https://vapaniwagivu.weebly.com/uploads/1/3/4/4/134442769/vinori-fajage.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://s3.amazonaws.com/bevekizadoxuj/free_tv_guide_magazine.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_073e1ba579424120b6e4ee6081720e1f.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_df49d53904d94b37a8dc9fd2bb2cfd4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/cohesion_policy_open_data_platform.pdfIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_6388eac932ae47a59fe0eba0e1d00ed1.pdf?index=trueIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_05a45816797041dca2be0df62b263e2c.pdf?index=trueIn PDF document text
    • https://9a4b5e96-23fe-4021-9525-787506808755.filesusr.com/ugd/b3318b_7db5beb576ef41f18061e12f80709552.pdf?index=trueIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_9866169dbf424a43a2323b1698fa4f52.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_71198920ea0e4789834b497e726fd308.pdf?index=trueIn PDF document text
    • https://a529afa0-707c-494d-9cee-e9df2360aa12.filesusr.com/ugd/a6e48a_e48afc9f0abd46d890d203f0e6cf8b55.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/how_to_work_a_sunbeam_microwave.pdfIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_9c670c0b8d0c42da8a33afba228fd9ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/69636208035.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_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 5224 bytes
SHA-256: 3da270d2b72b11010b798fa07a569e6f82ba51e3c1bc782673d702c41b3eab1b
font_01_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 11308 bytes
SHA-256: 92ba29e7f85e8848eb5cadb43018c8ed28cb0980236e8ead37b230a30079300f
font_02_sfnt_off000138c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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