Malicious PDF — malware analysis report

Static analysis result for SHA-256 6579236c7ec31f6a…

MALICIOUS

PDF

72.6 KB Created: 2021-03-02 12:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78300d99dfe15c2ce8c262646bcf4ed3 SHA-1: 263857d30515ee0d2bc93a987cba06a98befa1a2 SHA-256: 6579236c7ec31f6a071a888bb9fae93aa846f18b02c3cce3b1eeab099530c5ff
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://bologen.ru/123?utm_term=the+hunger+games+catching+fire+online+free+123 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426688/normal_602a70ad0b9c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5fef8c48debf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426269/normal_6017ac6280772.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465267/normal_5fe8b3b961aac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_603c2433e2ad8.pdfIn PDF document text
    • https://gilulunerokife.weebly.com/uploads/1/3/5/2/135296548/kanupoxodos-gumivu-piropobifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445736/normal_600b739881c40.pdfIn PDF document text
    • http://sportplays.ru/content-_transfer-_encoding_quoted-_printable_htmlkd69q.pdfIn PDF document text
    • http://xisulekotitis.iblogger.org/55965558617.pdfIn PDF document text
    • http://lizubujakus.22web.org/the_voynich_manuscript_by_unknown.pdfIn PDF document text
    • https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/mojojugotu.pdfIn PDF document text
    • http://sexesex.site/jo_badal_barse_song9ty5o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384471/normal_603a853692efb.pdfIn PDF document text
    • https://papafamibupa.weebly.com/uploads/1/3/0/7/130775965/jinusuxejejadun.pdfIn PDF document text
    • https://migawonakizize.weebly.com/uploads/1/3/1/6/131637147/1618583.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480899/normal_601b435abec62.pdfIn PDF document text
    • http://meetsoda.pro/language_guide_italian_grammar5pxl3.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
    • http://fabodatutowew.epizy.com/6771605726.pdfIn PDF document text
    • http://vuwejamadadodi.epizy.com/bmw_330i_2018_owners_manual.pdfIn PDF document text
    • http://nebunotan.rf.gd/reliability_and_validity_analysis.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_off0000d185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD185 5472 bytes
SHA-256: 7d9a09751ec57dabbad9e30f16a58183722a425683245fdb1086337b1325c0b1
font_01_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10128 bytes
SHA-256: db90a9265012d8bea790d8ad7ec2fd7c2f482bb2dbea6f755d5b991d9b0d326a
font_02_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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