Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1423aa7d415d56e…

MALICIOUS

PDF

83.1 KB Created: 2021-01-07 21:17:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 0990fbbf075abf24e31fbfbe98cfdf6d SHA-1: dc73433cbd6a328370d090219fa64fc69b1aad18 SHA-256: e1423aa7d415d56e63bcb9ea3b9df13e222f7dc7e3a671b351f64a95328f4c81
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The presence of a large number of external links suggests an attempt to direct users to potentially harmful websites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://traffking.ru/aws?utm_term=complex+numbers+problems+iit+level+pdf In PDF document text
    • https://pixumoxijabana.weebly.com/uploads/1/3/4/7/134748481/fcebd3156a.pdfIn PDF document text
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/7382483.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/hhjmFTq/cpa_yellow_book_cpe_requirements.pdfIn PDF document text
    • https://gemiwanot.weebly.com/uploads/1/3/4/4/134495393/4863c8eda.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/jjChjc2/20_animal_facts_you_didn_t_know.pdfIn PDF document text
    • https://cdn.sqhk.co/fakomuse/0Khicge/fumuxir.pdfIn PDF document text
    • https://sopogokatoluj.weebly.com/uploads/1/3/1/0/131071191/5601959.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/wiwuxot/hairy_cell_leukemia_nccn_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/48840400940.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9927bae2-6e41-4d67-9bcc-814e449dfe27/manual_for_kenmore_elite_he3_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/the_human_body_systems_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tabobujimo/sofosurulon.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/56724389143.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_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 5148 bytes
SHA-256: 3bac45bb428e10a7a170336e068273fc2f6b93061a62593e7a8ee3628299262d
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 12156 bytes
SHA-256: baeb46d437918f9a96c283f8d541b6aa748e010bae4575228c76775f13cc71c1
font_02_sfnt_off00013162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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