Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdb99cacf0c2573…

MALICIOUS

PDF

86.2 KB Created: 2021-02-22 01:48:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0b54d81fc9bd68fc0e59e58e85895eb7 SHA-1: 249a2b0f1021806ef5212f2a727330ebec2be2e7 SHA-256: 5cdb99cacf0c257317781033288820a538565547ec38abde6c725f632b89b77c
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to link farms and redirector infrastructure, indicating a phishing or malicious content distribution attempt. The embedded URL 'https://yafferge.ru/wb?keyword=how%20do%20you%20contact%20hr' is flagged as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent.

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/wb?keyword=how%20do%20you%20contact%20hr In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445880/normal_5fda8beac4103.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_600afaf713ea0.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/sutojuxadovuba.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/11bddfcdbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489713/normal_602d849aa5ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426677/normal_6017a42f18eab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500893/normal_5ffd5bc773cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_6021cc5865908.pdfIn PDF document text
    • https://rutizinudepedo.weebly.com/uploads/1/3/4/4/134483735/3597640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_60027cd0eda1c.pdfIn PDF document text
    • https://xoxajunun.weebly.com/uploads/1/3/4/3/134351876/0b6aadd9.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/sojenozap/turemonulakelivam.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/83788466469.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/sozuxunil.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/97308632991.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/noun_verb_adjective_adverb_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/vufarosi.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/wejesifadikapiwusaxad.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/check_your_english_vocabulary_online.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/lagu_betrand_peto_terbaru.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_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 4972 bytes
SHA-256: 7899b4829f25dd8cb2336676c278bbf4f47ee7c375fe6918f6be99af041d9e81
font_01_sfnt_off00012666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12666 11104 bytes
SHA-256: beb0b200f772fe559bbc59d97cdfcd85e5cca316c445940e5aba70f102d434fc

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