Malicious PDF — malware analysis report

Static analysis result for SHA-256 75fb03c7324eb431…

MALICIOUS

PDF

73.3 KB Created: 2021-04-03 04:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cdfab075593fdf0f369592b810a24d38 SHA-1: 8b7db778d701660b3bdcf06852e3b7951479081a SHA-256: 75fb03c7324eb4317427d10ef20836aff1a89eb7dfadd2e168e491de9c35e297
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://dafemum.ru/strik?utm_term=how+to+fix+a+spiral+bound+book PDF link annotation
    • https://cdn.sqhk.co/gasajolop/QODgdsr/wefutenajabexaluligetij.pdfIn PDF document text
    • http://fb-ig-violation.com/190174893166r3ho.pdfIn PDF document text
    • http://kismyketio.com/the_sign_of_the_chrysanthemum_lexile_level1ypz4.pdfIn PDF document text
    • http://milesnires.xyz/lopexj85yw.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/0jfxjfx/black_forest_cake_design.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/oTLMjsD/edmentum_assessments_answer_key_algebra_2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/application_software_in_information_technology.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_3584a93591c84b5a8085ea52067a64c6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6f010b6-cfd1-433c-98b9-17731d5e9ac7/common_core_state_standards_hawaii.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1d4c6ab-9706-445b-9274-fe1274bd4988/define_local_government_autonomy.pdfIn PDF document text
    • https://a4758657-6aaa-4003-b0f6-1957e800abfd.filesusr.com/ugd/70c1f8_a8301d8f798a4e3fb17e5fa05d2087a4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c956f7-f5d6-4b3c-9fae-65d99c525be4/how_to_crochet_hair_no_braids.pdfIn PDF document text
    • https://cc652f91-b1ab-470c-b36f-46d838ef85b2.filesusr.com/ugd/fbccce_a08f730524334f3da109ece1892f2972.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jijumupade/axial_scx10_ii_rtr_manual.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_883865ef103b4ef9bd7f163ed199f593.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/verirejon/jira_backlog_filter_by_reporter.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/almaden_community_center_activity_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990abb91-5839-43a1-a550-248a7e9c2de0/black_and_decker_rice_cooker_plus_measuring_cup_size.pdfIn PDF document text
    • https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_40a515af6fdd4f5eb7d323e8311354be.pdf?index=trueIn 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_off0000dfa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA0 5360 bytes
SHA-256: f8739b9f48ad9f07b05886560872f0455a6c4434fdc3e00da8c420af6035d0bf
font_01_sfnt_off0000f1f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F3 10708 bytes
SHA-256: 04a7daa59339f9fa8eba3cd272045b33d5e8de3f645ed8488246d6e7cd00e884

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