Malicious PDF — malware analysis report

Static analysis result for SHA-256 31bab85b66defd22…

MALICIOUS

PDF

74.6 KB Created: 2021-04-02 03:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: de677f905d69409334821852a86df740 SHA-1: 70a5cc193698e99682a094eb34cbdcf621244aac SHA-256: 31bab85b66defd22e32244177ae675bc34c702a8dee5643cef5ac86f3895db6f
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pelibifir.ru/strik?utm_term=examples+of+symbolism+in+sinners+in+the+hands+of+an+angry+god PDF link annotation
    • http://womenit.space/69431701680ob2xm.pdfIn PDF document text
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/pixiwa.pdfIn PDF document text
    • http://1fps.ru/kedisisexobomalujuguneb4km2y.pdfIn PDF document text
    • http://begdas.fun/xibupusowexepamcoxl2.pdfIn PDF document text
    • http://bestunew.xyz/line_6_pod_farm_tonesacq5z.pdfIn PDF document text
    • https://nojamatisi.weebly.com/uploads/1/3/1/3/131384142/rofitanasojen_vovoseraropax.pdfIn PDF document text
    • http://morugufuvak.iblogger.org/avogadro_s_law_sample_problem.pdfIn PDF document text
    • http://luminar3-download.xyz/cuantos_mililitros_son_50_gramos_de_aguakfu01.pdfIn PDF document text
    • https://diwamelebo.weebly.com/uploads/1/3/4/1/134108813/71ad9ef4e4.pdfIn PDF document text
    • http://shopsmmv.site/sapisawitukelivkox7e.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/1985795.pdfIn PDF document text
    • http://myshoes.moscow/what_is_the_oldest_known_civilization_in_central_and_south_americaxl9tx.pdfIn PDF document text
    • http://aicberg.net/pokemon_infinite_fusion_rom_download_androidu8lk3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuselufuzo/chsl_2019_form_fee.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/rifagobiniluzebezixeb.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/toto_washlet_s350e_installation_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/ethical_dilemma_in_nursing.pdfIn PDF document text
    • http://puzexexaniledow.epizy.com/sidetiperosifo.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/73706686832.pdfIn PDF document text
    • http://fasadokejofis.epizy.com/android_one_xiaomi_mi_8.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/75299866550.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 5720 bytes
SHA-256: 5867dca45c0462c0e27571a76f281775a7ff2e7a0ff6e9033d6445c9151938e4
font_01_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 10152 bytes
SHA-256: 9626d586d1baeb4516fe676d256ee79e94eeaac614b89c4f4ddde13f7c74c2bd