Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3553abdc1d3478e…

MALICIOUS

PDF

67.8 KB Created: 2021-05-09 10:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 52bb3e4dffd9657a54ae90c483b9524d SHA-1: acc4b0ed1b580f73e3834009069f7b90e4d62834 SHA-256: a3553abdc1d3478e47103def66838caa6e749d4b8952df126e42de7e358462eb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 to benign-looking documents, but one URL points to a domain associated with phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to printer support, likely to drive traffic to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://ponafet.ru/strik?utm_term=how+do+i+fix+my+hp+printer+scanner PDF link annotation
    • https://gasogufimuti.weebly.com/uploads/1/3/4/4/134461051/dezejigupiriladib.pdfIn PDF document text
    • https://kofezewi.weebly.com/uploads/1/3/2/3/132302944/3441877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492253/normal_5ffe5204028bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388285/normal_60049d3141205.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fc868c126666.pdfIn PDF document text
    • https://mosezusimoz.weebly.com/uploads/1/3/1/6/131637881/4952376.pdfIn PDF document text
    • http://mufinofol.scienceontheweb.net/69651124933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_6067688293a52.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wozimape.onlinewebshop.net/geometric_and_arithmetic_sequences.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/alphabet_francais_a_imprimer.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/tujhe_dil_da_vasta_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/tolitapozekolad.pdfIn PDF document text
    • http://wobanunep.myartsonline.com/grohe_thermostaatkraan_ontkalken.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/damask_split_king_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/remington_700_adl_owners_manual.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_716e87fc28f14d5ba11cc4bab8748d1c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gofiguj/state_solubility_of_chloroform_in_water.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/what_are_camera_shots_in_film.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/bow_tie_pasta_salad_with_ranch_dressing.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/83120595553.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/limirexuranupod.pdfIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_e45cd3971a20489aa989a803c7151e56.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_off0000ccab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAB 5588 bytes
SHA-256: 991bb1f572a7b4a7d9a686956ea8d8f446b468cc5c4085ce86e8db7227b93ed9
font_01_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 9980 bytes
SHA-256: cce140ca781fdf1630736225ef59597cf2f0c8a17bdb0d78f4c1f2028ba9ebdf

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