Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6d0d3cb6c95c25…

MALICIOUS

PDF

82.2 KB Created: 2021-04-25 21:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6a08a69b5093505828af5933a135a4ac SHA-1: c9af2172eebbf6e1ed3f754bac1affa1a8cba824 SHA-256: 6b6d0d3cb6c95c250338833d1b61137bc421f0ea010d69fbc9e88a0ccfabcd90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and link farms, indicating a phishing or spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and link farm heuristics points towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/strik?utm_term=manual+impresora+hp+photosmart+plus+b209a PDF link annotation
    • http://sadovik.me/fmcsa_guidelines_on_personal_conveyancebxuq2.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/1e9ba221677.pdfIn PDF document text
    • https://pepagefowajuna.weebly.com/uploads/1/3/4/7/134738543/162318.pdfIn PDF document text
    • http://vzroslyh.net/libotetanesezifizanefa5ltm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456119/normal_5fe11fb1a16bb.pdfIn PDF document text
    • http://constructionhouse.info/bojangles_chicken_supremes_combo_caloriesbs073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5feb23fb34b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_605720f782d11.pdfIn PDF document text
    • https://masizomomom.weebly.com/uploads/1/3/2/6/132681315/pavukugokiwe-zalinuxo-biwidib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_60121e706dabc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_601392952f4d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6034d38b2e04e.pdfIn PDF document text
    • http://jumbochecker.com/tc_electronic_flashback_x4_delay_and_looper2tt4v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460972/normal_6052ed58f2d8f.pdfIn PDF document text
    • http://profer-opt.ru/how_much_do_car_mechanics_make_per_hourhcd9r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411491/normal_606cf68731e30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_6019a4d8e1a2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/037de598-1df6-4625-ad59-47ec7a7daa12/39934498115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67901f17-09b6-4bc1-b877-1b6267f83035/nelela.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/43466800405.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/gevofewojujik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa1c276c-3485-4a05-9d21-0dff7d7a2183/i_dont_care_what_you_say_anymore_its_my_life_lyrics.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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 3724 bytes
SHA-256: ce22c8eaa1f53a77d563481fc3f0abc202627ce0e69ac912df19b60822d178aa
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 5632 bytes
SHA-256: 85df3e5a8e18a37ec01e975e290a180c0805564444336b2ba2f61df7da432596
font_02_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16404 bytes
SHA-256: d01dd38415d98b835931b5b6ab7906f1b6220c3de3e57cec06458c69fd40fe15

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