Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe98a8cef7586a4…

MALICIOUS

PDF

75.9 KB Created: 2021-03-16 17:05:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 756047f46a7b5eab0bbc3b3c0f051c6b SHA-1: 29d34549ad021a6518c1d679ad895057e34bed57 SHA-256: efe98a8cef7586a4d7da3083bc78eeb42395163b93a0bc58227c29a92dfdf8c8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or lead to benign-looking documents, suggesting a link farm or phishing lure. The primary malicious URL identified is 'https://baarspo.ru/strik?utm_term=porter+cable+fn250a+rebuild+kit', which is likely used to redirect users to a malicious site or download a payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/strik?utm_term=porter+cable+fn250a+rebuild+kit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://53ebb62d-ddaf-432f-8dc3-1f4746653467.filesusr.com/ugd/bbd3cf_88351988561c4c29ba91de8da56954ef.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ba553bcc-0a44-4eb6-8b32-ef1abcbb6121/tasty_ultimate_cookbook_free_download.pdf
    • https://s3.amazonaws.com/norozovijalu/audio_technica_at-_lp120_usb_manual.pdf
    • https://s3.amazonaws.com/mipeboro/pancreas_cancer_diagnosis_guideline.pdf
    • https://s3.amazonaws.com/xufujofaleki/human_body_systems_worksheets_4th_grade.pdf
    • https://s3.amazonaws.com/bisiku/wall_street_journal_customer_service_subscription.pdf
    • https://s3.amazonaws.com/ritoma/commerce_sync_reviews.pdf
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_a84920360f8e45d19830c9abc3678188.pdf?index=true
    • https://uploads.strikinglycdn.com/files/69355a04-ff3d-4dce-b999-c0bbfbf10d76/2012_jeep_grand_cherokee_limited_4x4_review.pdf
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_786a2a476d754fa1b7c9163cea2c05a2.pdf?index=true
    • https://s3.amazonaws.com/nemafu/vadofunukenofowitagut.pdf
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_acfb73bc44ae4489b8cdc0d576b6578a.pdf?index=true
    • https://s3.amazonaws.com/zagapaxa/mexico_creo_en_ti_poema.pdf
    • https://s3.amazonaws.com/zabejuvijolu/goldbrick_crossword_answer.pdf
    • https://s3.amazonaws.com/xazarujokemus/18440365853.pdf
    • https://s3.amazonaws.com/kegubinefuda/blood_bowl_2_stadium_level_4.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_2d0bc3172ab84f3bb9d654cb4ac66492.pdf?index=true
    • https://s3.amazonaws.com/bededuxotulapil/46462706550.pdf
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_46488f2e9e884a3094126b798423612f.pdf?index=true
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_863faeb02e7c40a09bc20af53a27d341.pdf?index=true
    • https://uploads.strikinglycdn.com/files/188f0ba3-120d-4e76-a9bf-fb73b70b9ef8/bose_acoustimass_10_series_v.pdf
    • https://uploads.strikinglycdn.com/files/42ef4233-ce62-4559-9875-1e26aaa98ee9/how_do_you_replace_a_sewing_machine_needle.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5c.bin
1b9e75988388ef0dfc919aae37ac1d8fa4665d1f2d4ddbad48b18d95f7e71f91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 5440 bytes
font_01_sfnt_off0000fcf1.bin
05d9d7db5f0182999bb5efa1085c282682044b98ab103654cd64e2512688aad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 10456 bytes

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