Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8dee12deca1b9d…

MALICIOUS

PDF

77.2 KB Created: 2021-02-28 06:07:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8456fc20d20e32e1c2bace5f561d27c5 SHA-1: fb454760e4be603a3a24a2a7ac3da678108273d8 SHA-256: 2d8dee12deca1b9d2bae88916008f9cab5b73b3b6b61320ee4f5160b321562f9
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external resources, which is flagged as a link farm. One of the primary URLs, 'https://yafferge.ru/wb?keyword=polaris%20office%20free', is identified as a malicious redirector. The ML classifier and ClamAV also strongly indicate maliciousness, consistent with a phishing or SEO manipulation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wb?keyword=polaris%20office%20free In PDF document text
    • http://100naturals.fun/gojuwererakezexuxifeduo3i1e.pdfIn PDF document text
    • https://jumuwubugunitus.weebly.com/uploads/1/3/1/0/131070493/149869.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/jalijefosab_rasodefafuk_pazel.pdfIn PDF document text
    • https://xamubamujizej.weebly.com/uploads/1/3/1/4/131483378/d9d2b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/suxowazoduxa.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/copy_conditional_formatting_rules_to_another_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/adeste_fideles_spartito_coro_4_voci.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/27524661543.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/honeywell_6160_keypad_battery_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/mizeteb/tukefiruju.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/chillar_party_songs_ming.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/characteristics_of_transformational_leadership_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/malaysia_coin_collection_value_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/cube_and_cube_roots_worksheets.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 4480 bytes
SHA-256: e2554c95663ec3ce4e68f480d81e792b541c0ba2a907e88f4c34914277f560ec
font_01_sfnt_off0000f4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E6 10784 bytes
SHA-256: 65351f02ab3bf49b44786b18de934611f6b58b8af0825c09e7678a3fa7db4297
font_02_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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