Malicious PDF — malware analysis report

Static analysis result for SHA-256 66411de593681941…

MALICIOUS

PDF

74.4 KB Created: 2021-01-06 12:20:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 81cf7bf09fd07f144e100a625393243f SHA-1: fa73491abda8dce84b0efb5636c126526b420751 SHA-256: 66411de593681941b19e0ac354c3bd2f536f96f54937933d949030245b8c8ccd
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to direct users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://ggtraff.ru/aws?utm_term=android+device+manager+app+for+pc In PDF document text
    • https://cdn.sqhk.co/vopufepivipe/enx6fie/mijamidububofajogux.pdfIn PDF document text
    • https://cdn.sqhk.co/xewazezikufi/cidiagn/96310779934.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/zRhCdib/4903599244.pdfIn PDF document text
    • https://pajowivi.weebly.com/uploads/1/3/4/9/134904739/toragopazesuvuseke.pdfIn PDF document text
    • https://woxomeze.weebly.com/uploads/1/3/4/4/134498023/zodutun-joloxa-zazazubedubawum.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/rusati.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/nosabamukekuxo_ravarokikab_fupukupo_nuwivewabuz.pdfIn PDF document text
    • https://satizivuzaked.weebly.com/uploads/1/3/4/3/134383512/molunijezodek.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/fekife/formation_administrateur_ad_hoc_mineur.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/zizewosamowaxexutoxoduku.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/vexaw.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/biology_florida_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/zhu_scalp_acupuncture.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/jelalajiledizepip.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/difijufijuj.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/4776271138.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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 5024 bytes
SHA-256: 9334503d5cf8a57dac2b37d44e6cc6bc2b02234bfbc332dbd90e3dc57e4d63b1
font_01_sfnt_off0000eb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 10252 bytes
SHA-256: f7133bf82d668cd0429b0fb467ead4eb58d3114356d552849ffba9c993f03665
font_02_sfnt_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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