Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab98e05105ee4a1…

MALICIOUS

PDF

80.2 KB Created: 2021-02-15 19:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 44f84e525044556d1cea4d6085ef56f6 SHA-1: 5a1062b4940eb2f226627b0baaaa6414e2674163 SHA-256: 9ab98e05105ee4a1ee18d8ed213d698fe7c9c48553db05cf9f81e50943f43bdb
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs suggest an attempt to direct the user to malicious content, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=does+costco+install+central+air+conditioners In PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_5fe4f0d77c0a2.pdfIn PDF document text
    • https://sotezogurew.weebly.com/uploads/1/3/2/7/132740991/fuwisot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408174/normal_6023349ca9006.pdfIn PDF document text
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/wasaburuvujupakag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403273/normal_60232efb11ba7.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/6730368.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/1403962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460045/normal_6015c2d48f3a7.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/xebuvuwov/apache_camel_tutorialspoint.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/tobap.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/basketball_tryouts_flyer_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/c_difficile_treatment_nice_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/ciaphas_cain_death_or_glory.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/avery_3381_postcards_index_cards_templates.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_off0000efb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB0 4720 bytes
SHA-256: d086e1ce77470ec90f75fe728dc9ab7c3eae81dd505313d8b11cb484cc365baa
font_01_sfnt_off0000ffb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB8 11112 bytes
SHA-256: 68db74eda2e97ec5d21bd63695a2a74fd65ba63c6c1d69c5f648f78fe0d79b53
font_02_sfnt_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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