Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97e35063a719970…

MALICIOUS

PDF

82.8 KB Created: 2021-03-13 15:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51637f7da9208c6b1767d7e39cb6db07 SHA-1: d2a4d190ac3943e7f07cea283f4d03b3ca72af14 SHA-256: f97e35063a719970318b0db432e4133d935bd6eabe01b91f7862cfb25ed4e1d2
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/123?utm_term=pa+boating+license+answers
    • http://arevakar-travel.com/biomass_energy_researchicso8.pdf
    • http://fastpeysistem.online/how_to_write_a_short_communication_paper7wxuy.pdf
    • http://baby-slings.ru/26388646930hee0o.pdf
    • http://sdfafq.info/fikoburovimosfbyom.pdf
    • http://totalcreditcheck.info/909229464116zql8.pdf
    • http://svarka-aurora.online/hp_laserjet_p4015n_specstwpfi.pdf
    • http://dimax.website/maersk_line_bill_of_lading_templaterwa7a.pdf
    • http://spiritstudio.ru/129103820795xj6j.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakajoziwibi/distillation_column_design_calculation_free.pdf
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_89db9435d4324707be2382be1702ea38.pdf?index=true
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_5f43055d201a4b9ca00f2bfe63595c2b.pdf?index=true
    • https://s3.amazonaws.com/kelageketisefuv/ribowafopujof.pdf
    • https://s3.amazonaws.com/fedufiporara/ladolevatexomu.pdf
    • http://luxonaniburiliv.epizy.com/vurumatogesusixugu.pdf
    • https://b564fea6-732e-489f-a029-a72dc6590de2.filesusr.com/ugd/6a4619_540b3c70e58e4015913f0e0e35b2b0ce.pdf?index=true
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_ee2f1bdfe2784a209e1fdc56baa38e4f.pdf?index=true
    • https://s3.amazonaws.com/bulolimepol/resedobatovanabiju.pdf
    • https://s3.amazonaws.com/gelawiweza/free_bomber_jacket_template_psd.pdf
    • https://s3.amazonaws.com/risalenefazozo/57491358457.pdf
    • http://nagajawonusagu.epizy.com/aaruthra_movie_all_songs.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_off000104de.bin
a00448423e82ba9d9626932ea6248a5f0ad225fa14bab1edc7fab006da5415ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 5200 bytes
font_01_sfnt_off000116b1.bin
6b009c136d7cc94ed258c9d2e731d3f4dab0bbb40c37824c2e4a6cf2c7b0194c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 11648 bytes

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